KENNEDY SPACE CENTER, FLA. - Prior to the third launch attempt on mission STS-121, Mission Specialist Piers Sellers fixes one of his gloves during suitup before heading to Launch Pad 39B. The July 2 launch attempt was scrubbed due to the presence of showers and thunderstorms within the surrounding area of the launch site. The launch of Space Shuttle Discovery on mission STS-121 is the 115th shuttle flight and the 18th U.S. flight to the International Space Station. During the 12-day mission, the STS-121 crew will test new equipment and procedures to improve shuttle safety, as well as deliver supplies and make repairs to the International Space Station. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. - Prior to the third launch attempt on mission STS-121, Pilot Mark Kelly fixes his glove during suitup before heading to Launch Pad 39B. The July 2 launch attempt was scrubbed due to the presence of showers and thunderstorms within the surrounding area of the launch site. The launch of Space Shuttle Discovery on mission STS-121 is the 115th shuttle flight and the 18th U.S. flight to the International Space Station. During the 12-day mission, the STS-121 crew will test new equipment and procedures to improve shuttle safety, as well as deliver supplies and make repairs to the International Space Station. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. - Getting ready for a third launch attempt on mission STS-121, Mission Specialist Stephanie Wilson is suiting up before heading to Launch Pad 39B. The July 2 launch attempt was scrubbed due to the presence of showers and thunderstorms within the surrounding area of the launch site. The launch of Space Shuttle Discovery on mission STS-121 is the 115th shuttle flight and the 18th U.S. flight to the International Space Station. During the 12-day mission, the STS-121 crew will test new equipment and procedures to improve shuttle safety, as well as deliver supplies and make repairs to the International Space Station. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. - Prior to the third launch attempt on mission STS-121, Mission Specialist Thomas Reiter is suiting up before heading to Launch Pad 39B. The July 2 launch attempt was scrubbed due to the presence of showers and thunderstorms within the surrounding area of the launch site. The launch of Space Shuttle Discovery on mission STS-121 is the 115th shuttle flight and the 18th U.S. flight to the International Space Station. During the 12-day mission, the STS-121 crew will test new equipment and procedures to improve shuttle safety, as well as deliver supplies and make repairs to the International Space Station. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. - Prior to the third launch attempt on mission STS-121, Mission Specialist Stephanie Wilson gets help with her helmet during suitup before heading to Launch Pad 39B. The July 2 launch attempt was scrubbed due to the presence of showers and thunderstorms within the surrounding area of the launch site. The launch of Space Shuttle Discovery on mission STS-121 is the 115th shuttle flight and the 18th U.S. flight to the International Space Station. During the 12-day mission, the STS-121 crew will test new equipment and procedures to improve shuttle safety, as well as deliver supplies and make repairs to the International Space Station. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. - Prior to the third launch attempt on mission STS-121, Commander Steven Lindsey looks thoughtful as he completes suiting up before heading to Launch Pad 39B. The July 2 launch attempt was scrubbed due to the presence of showers and thunderstorms within the surrounding area of the launch site. The launch of Space Shuttle Discovery on mission STS-121 is the 115th shuttle flight and the 18th U.S. flight to the International Space Station. During the 12-day mission, the STS-121 crew will test new equipment and procedures to improve shuttle safety, as well as deliver supplies and make repairs to the International Space Station. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. - After suiting up in his launch suit, Mission Specialist Michael Fossum gives a thumbs up for a third launch attempt on mission STS-121. The July 2 launch attempt was scrubbed due to the presence of showers and thunderstorms within the surrounding area of the launch site. The launch of Space Shuttle Discovery on mission STS-121 is the 115th shuttle flight and the 18th U.S. flight to the International Space Station. During the 12-day mission, the STS-121 crew will test new equipment and procedures to improve shuttle safety, as well as deliver supplies and make repairs to the International Space Station. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. - STS-121 Commander Steven Lindsey is eager for a third launch attempt on the mission. Here, he is donning his launch suit before heading to Launch Pad 39B. The July 2 launch attempt was scrubbed due to the presence of showers and thunderstorms within the surrounding area of the launch site. The launch of Space Shuttle Discovery on mission STS-121 is the 115th shuttle flight and the 18th U.S. flight to the International Space Station. During the 12-day mission, the STS-121 crew will test new equipment and procedures to improve shuttle safety, as well as deliver supplies and make repairs to the International Space Station. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. - Mission Specialist Thomas Reiter, happy to be making a third launch attempt on mission STS-121, is suited up before heading to Launch Pad 39B. The July 2 launch attempt was scrubbed due to the presence of showers and thunderstorms within the surrounding area of the launch site. The launch of Space Shuttle Discovery on mission STS-121 is the 115th shuttle flight and the 18th U.S. flight to the International Space Station. During the 12-day mission, the STS-121 crew will test new equipment and procedures to improve shuttle safety, as well as deliver supplies and make repairs to the International Space Station. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. - Prior to the third launch attempt on mission STS-121, Mission Specialist Thomas Reiter is helped with his launch suit before heading to Launch Pad 39B. The July 2 launch attempt was scrubbed due to the presence of showers and thunderstorms within the surrounding area of the launch site. The launch of Space Shuttle Discovery on mission STS-121 is the 115th shuttle flight and the 18th U.S. flight to the International Space Station. During the 12-day mission, the STS-121 crew will test new equipment and procedures to improve shuttle safety, as well as deliver supplies and make repairs to the International Space Station. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. - STS-121 Mission Specialist Lisa Nowak is helped with her boots during suitup before heading to Launch Pad 39B and a third launch attempt. The July 2 launch attempt was scrubbed due to the presence of showers and thunderstorms within the surrounding area of the launch site. The launch of Space Shuttle Discovery on mission STS-121 is the 115th shuttle flight and the 18th U.S. flight to the International Space Station. During the 12-day mission, the STS-121 crew will test new equipment and procedures to improve shuttle safety, as well as deliver supplies and make repairs to the International Space Station. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. - STS-121 Commander Steven Lindsey is eager for a third launch attempt on the mission. Here, he is donning his launch suit before heading to Launch Pad 39B. The July 2 launch attempt was scrubbed due to the presence of showers and thunderstorms within the surrounding area of the launch site. The launch of Space Shuttle Discovery on mission STS-121 is the 115th shuttle flight and the 18th U.S. flight to the International Space Station. During the 12-day mission, the STS-121 crew will test new equipment and procedures to improve shuttle safety, as well as deliver supplies and make repairs to the International Space Station. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. - Prior to the third launch attempt on mission STS-121, Pilot Mark Kelly is helped with his boots during suitup before heading to Launch Pad 39B. The July 2 launch attempt was scrubbed due to the presence of showers and thunderstorms within the surrounding area of the launch site. The launch of Space Shuttle Discovery on mission STS-121 is the 115th shuttle flight and the 18th U.S. flight to the International Space Station. During the 12-day mission, the STS-121 crew will test new equipment and procedures to improve shuttle safety, as well as deliver supplies and make repairs to the International Space Station. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. - STS-121 Mission Specialist Lisa Nowak is happy to be making a third launch attempt on the mission. She is suiting up before heading to Launch Pad 39B. The July 2 launch attempt was scrubbed due to the presence of showers and thunderstorms within the surrounding area of the launch site. The launch of Space Shuttle Discovery on mission STS-121 is the 115th shuttle flight and the 18th U.S. flight to the International Space Station. During the 12-day mission, the STS-121 crew will test new equipment and procedures to improve shuttle safety, as well as deliver supplies and make repairs to the International Space Station. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. - Prior to the third launch attempt on mission STS-121, Mission Specialist Michael Fossum is helped with his launch suit before heading to Launch Pad 39B. The July 2 launch attempt was scrubbed due to the presence of showers and thunderstorms within the surrounding area of the launch site. The launch of Space Shuttle Discovery on mission STS-121 is the 115th shuttle flight and the 18th U.S. flight to the International Space Station. During the 12-day mission, the STS-121 crew will test new equipment and procedures to improve shuttle safety, as well as deliver supplies and make repairs to the International Space Station. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. - The STS-121 crew displays the spirit of the Fourth of July holiday with their flags and their eagerness to launch as they stride out of the Operations and Checkout Building. Leading the way are Pilot Mark Kelly (left) and Commander Steven Lindsey (right). Behind them are Mission Specialists (second row) Lisa Nowak and Michael Fossum; (third row) Stephanie Wilson and Piers Sellers; and (at the rear) Thomas Reiter, who represents the European Space Agency. The July 2 launch attempt was scrubbed due to the presence of showers and thunderstorms within the surrounding area of the launch site. The launch of Space Shuttle Discovery on mission STS-121 is the 115th shuttle flight and the 18th U.S. flight to the International Space Station. During the 12-day mission, the STS-121 crew will test new equipment and procedures to improve shuttle safety, as well as deliver supplies and make repairs to the International Space Station. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. - Waving flags for the Fourth of July, the STS-121 crew heads for the Astrovan and the ride to Launch Pad 39B for a third launch attempt. Leading the way are Pilot Mark Kelly (left) and Commander Steven Lindsey (right). Behind them are, left and right, Mission Specialists (second row) Lisa Nowak and Michael Fossum; (third row) Stephanie Wilson and Piers Sellers; and (at the rear) Thomas Reiter, who represents the European Space Agency. The July 2 launch attempt was scrubbed due to the presence of showers and thunderstorms within the surrounding area of the launch site. The launch of Space Shuttle Discovery on mission STS-121 is the 115th shuttle flight and the 18th U.S. flight to the International Space Station. During the 12-day mission, the STS-121 crew will test new equipment and procedures to improve shuttle safety, as well as deliver supplies and make repairs to the International Space Station. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. - Trying a third time for launch, and still smiling, the STS-121 crew gathers again for the traditional breakfast before suiting up. Seated left to right are Mission Specialists Piers Sellers and Michael Fossum, Pilot Mark Kelly, Commander Steven Lindsey, and Mission Specialists Lisa Nowak, Stephanie Wilson and Thomas Reiter, who represents the European Space Agency. The July 2 launch attempt was scrubbed due to the presence of showers and thunderstorms within the surrounding area of the launch site. The launch of Space Shuttle Discovery on mission STS-121 is the 115th shuttle flight and the 18th U.S. flight to the International Space Station. During the 12-day mission, the STS-121 crew will test new equipment and procedures to improve shuttle safety, as well as deliver supplies and make repairs to the International Space Station. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. - Mission Specialist Piers Sellers is happy to be making a third launch attempt on mission STS-121. Here, he fixes one of his gloves during suitup before heading to Launch Pad 39B. The July 2 launch attempt was scrubbed due to the presence of showers and thunderstorms within the surrounding area of the launch site. The launch of Space Shuttle Discovery on mission STS-121 is the 115th shuttle flight and the 18th U.S. flight to the International Space Station. During the 12-day mission, the STS-121 crew will test new equipment and procedures to improve shuttle safety, as well as deliver supplies and make repairs to the International Space Station. Photo credit: NASA/Kim Shiflett

JSC2006-E-28444 (18 July 2006) --- Astronaut Mark E. Kelly, STS-121 pilot, speaks from a lectern in Ellington Field's Hangar 276 near Johnson Space Center during the STS-121 crew return ceremonies.

JSC2006-E-28458 (18 July 2006) --- Astronaut Steven W. Lindsey, STS-121 commander, speaks from a lectern in Ellington Field's Hangar 276 near Johnson Space Center during the STS-121 crew return ceremonies.

JSC2006-E-28439 (18 July 2006) --- Flight director Tony Ceccacci speaks from a lectern in Ellington Field's Hangar 276 near Johnson Space Center during the STS-121 crew return ceremonies. Astronaut Steven W. Lindsey, STS-121 commander, is at left.

JSC2006-E-28463 (18 July 2006) --- Astronaut Steven W. Lindsey (left), STS-121 commander, and flight director Steve Stich visit in Ellington Field's Hangar 276 near JSC during the STS-121 crew return ceremonies.

JSC2006-E-28442 (18 July 2006) --- Astronaut Piers J. Sellers, STS-121 mission specialist, applauds during the STS-121 crew return ceremonies in Ellington Field's Hangar 276 near Johnson Space Center.

JSC2006-E-28449 (18 July 2006) --- Astronaut Michael E. Fossum, STS-121 mission specialist, speaks from a lectern in Ellington Field's Hangar 276 near Johnson Space Center during the STS-121 crew return ceremonies.

JSC2006-E-28451 (18 July 2006) --- Astronaut Lisa M. Nowak, STS-121 mission specialist, speaks from a lectern in Ellington Field's Hangar 276 near Johnson Space Center during the STS-121 crew return ceremonies.

JSC2006-E-28445 (18 July 2006) --- Astronaut Stephanie D. Wilson, STS-121 mission specialist, photographed in Ellington Field's Hangar 276 near Johnson Space Center during the STS-121 crew return ceremonies.

The STS-121 patch depicts the Space Shuttle docked with the International Space Station (ISS) in the foreground, overlaying the astronaut symbol with three gold columns and a gold star. The ISS is shown in the configuration that it was during the STS-121 mission. The background shows the nighttime Earth with a dawn breaking over the horizon. STS-121, ISS mission ULF1.1, was the final Shuttle Return to Flight test mission. This utilization and logistics flight delivered a multipurpose logistics module (MPLM) to the ISS with several thousand pounds of new supplies and experiments. In addition, some new orbital replacement units (ORUs) were delivered and stowed externally on the ISS on a special pallet. These ORUs are spares for critical machinery located on the outside of the ISS. During this mission the crew also carried out testing of Shuttle inspection and repair hardware, as well as evaluated operational techniques and concepts for conducting on-orbit inspection and repair.

Astronauts Steve Lindsey (left), Stephanie Wilson, Lisa Nowak and Piers Sellers meet with employees at NASA Stennis Space Center. The crewmembers on NASA's space shuttle mission STS-121, which launched July 4, 2006, thanked SSC's workers for their dedication and safe work history. `We feel blessed that you are a part of the NASA family,' Wilson said. All four expressed gratitude for the reliability of the space shuttle's main engines, which helped propel the STS-121 crew into orbit on their 13-day mission.

JSC2006-E-28432 (18 July 2006) --- NASA associate administrator Rex Geveden speaks from a lectern in Ellington Field's Hangar 276 near Johnson Space Center during the STS-121 crew return ceremonies.

JSC2006-E-28436 (18 July 2006) --- Flight director Annette Hasbrook speaks from a lectern in Ellington Field's Hangar 276 near Johnson Space Center during the STS-121 crew return ceremonies.

JSC2006-E-28426 (18 July 2006) --- Astronaut Steven W. Lindsey (left), STS-121 commander, and Johnson Space Center's (JSC) deputy director Robert D. Cabana, exchange thoughts upon the crew arrival at Ellington Field near Johnson Space Center (JSC).

JSC2006-E-28459 (18 July 2006) --- Johnson Space Center's (JSC) Director Michael L. Coats speaks from a lectern in Ellington Field's Hangar 276 near JSC during the STS-121 crew return ceremonies.

STS121-S-002 (5 April 2006) --- These seven astronauts take a break from training to pose for the STS-121 crew portrait. From the left are astronauts Stephanie D. Wilson, Michael E. Fossum, both mission specialists; Steven W. Lindsey, commander; Piers J. Sellers, mission specialist; Mark E. Kelly, pilot; European Space Agency (ESA) astronaut Thomas Reiter of Germany; and Lisa M. Nowak, both mission specialists. The crewmembers are attired in training versions of their shuttle launch and entry suit.

JSC2006-E-28428 (18 July 2006) --- Johnson Space Center's (JSC) director Michael L. Coats speaks from a lectern in Ellington Field's Hangar 276 near JSC during the STS-121 crew return ceremonies. Seated from the left are astronauts Steven W. Lindsey, commander; Mark E. Kelly, pilot; Michael E. Fossum, mission specialist; NASA associate administrator Rex Geveden; astronauts Lisa M. Nowak, Stephanie D. Wilson and Piers J. Sellers, mission specialists. Photo credit: NASA

S121-E-07024 (13 July 2006) --- European Space Agency (ESA) astronaut Thomas Reiter (bottom center), Expedition 13 flight engineer, and the STS-121 crewmembers pose in "star-burst" formation for an in-flight portrait in the Destiny laboratory of the International Space Station while Space Shuttle Discovery was docked with the station. Clockwise, around the circle from Reiter, are astronauts Michael E. Fossum, Lisa M. Nowak, both mission specialists; Steven W. Lindsey and Mark E. Kelly, commander and pilot, respectively; Stephanie D. Wilson and Piers J. Sellers, mission specialists. Reiter launched on the Space Shuttle Discovery with the STS-121 crew and officially became an Expedition 13 crewmember after the shuttle docked with the station.

JSC2006-E-32816 (3 August 2006) --- The crew of STS-121 attended opening day of the 12th "X Games" in Los Angeles Aug. 3, discussing their recent mission to the International Space Station with students and athletes. Astronaut Steven W. Lindsey (with microphone), commander, and his crew take time out of the question and answer session to watch "Rally Car" practice. The crew's visit also included presentations at the Jet Propulsion Laboratory and the California Science Center.

JSC2006-E-32814 (3 August 2006) --- The crew of STS-121 attended opening day of the 12th "X Games" in Los Angeles Aug. 3, discussing their recent mission to the International Space Station with students and athletes. Astronaut Mark E. Kelly, pilot, stands at the edge of the signature 80 foot high "Big Air Jump" skateboarding ramp - location for one of the event highlights. The crew's visit also included presentations at the Jet Propulsion Laboratory and the California Science Center.

jsc2024e052328 (July 22, 2024) --- NASA’s SpaceX Crew-9 Mission Specialist Stephanie Wilson focuses during the crew equipment interface test (CEIT). She has collectively spent 42 days in space aboard three space shuttle Discovery missions – STS-120, STS-121, and STS-131. Credit: SpaceX

These seven astronauts take a break from training to pose for the STS-121 crew portrait. From the left are mission specialists Stephanie D. Wilson, and Michael E. Fossum, Commander Steven W. Lindsey, mission specialist Piers J. Sellers, pilot Mark E. Kelly; European Space Agency (ESA) astronaut and mission specialist Thomas Reiter of Germany; and mission specialist Lisa M. Nowak. The crew members are attired in training versions of their shuttle launch and entry suit. The crew, first ever to launch on Independence Day, tested new equipment and procedures to improve shuttle safety, as well as delivered supplies and made repairs to the space station.

JSC2006-E-32815 (3 Aug. 2006) --- The crew of STS-121 attended opening day of the 12th "X Games" in Los Angeles Aug. 3, discussing their recent mission to the International Space Station with students and athletes. From left to right are astronauts Piers J. Sellers, Stephanie D. Wilson, Steven W. Lindsey, Michael E. Fossum, Lisa M. Nowak and Mark E. Kelly. In the background is the signature 80 foot high "Big Air Jump" skateboarding ramp - one of the event highlights. The crew's visit also included presentations at the Jet Propulsion Laboratory and the California Science Center.

KENNEDY SPACE CENTER, FLA. - During Crew Equipment Interface Test (CEIT) at NASA’s Kennedy Space Center, STS-121 crew members inspect the docking station to become familiar with using the sockets. STS-121 is the second Return to Flight mission to the International Space Station. During CEIT, the crew has an opportunity to get a hands-on look at the orbiter and equipment they will be working with on their mission. Mission STS-121 is scheduled to launch aboard Space Shuttle Atlantis in July.

KENNEDY SPACE CENTER, FLA. - In the Orbiter Processing Facility at NASA’s Kennedy Space Center, STS-121 Mission Specialist Michael E. Fossum practices using the Emergency Payload Door Closure Device. At right is Mission Specialist Lisa Nowak. STS-121 is the second Return to Flight mission. The crew is at KSC to participate in the Crew Equipment Interface Test (CEIT). During CEIT, the crew has an opportunity to get a hands-on look at the orbiter and equipment they will be working with on their missions. Mission STS-121 is scheduled to launch aboard Atlantis in July.

KENNEDY SPACE CENTER, FLA. - In Orbiter Processing Facility bay 1, STS-121 Mission Commander Steven W. Lindsey (right) and Pilot Mark E. Kelly inspect the windows in Atlantis' cockpit. The STS-121 crew is at KSC to participate in the Crew Equipment Interface Test (CEIT). During CEIT, the crew has an opportunity to get a hands-on look at the orbiter and equipment they will be working with on their mission. STS-121, the second Return to Flight mission, is scheduled to launch aboard Atlantis in July.

KENNEDY SPACE CENTER, FLA. - In Orbiter Processing Facility bay 1, United Space Alliance technicians help STS-121 Mission Commander Steven W. Lindsey (right) and Pilot Mark E. Kelly with an inspection of the windows in Atlantis' cockpit. The STS-121 crew is at KSC to participate in the Crew Equipment Interface Test (CEIT). During CEIT, the crew has an opportunity to get a hands-on look at the orbiter and equipment they will be working with on their mission. STS-121, the second Return to Flight mission, is scheduled to launch aboard Atlantis in July.

KENNEDY SPACE CENTER, FLA. - At Astrotech Space Operations in Titusville, Fla., STS-121 Mission Commander takes a look at a pump module. The STS-121 crew is at KSC to take part in Crew Equipment Interface Test activities, which provide hands-on experience with equipment they will use on-orbit. STS-121, the second Return to Flight mission, is targeted for launch in a lighted planning window of Sept. 9 to Sept. 25.

KENNEDY SPACE CENTER, FLA. - STS-121 Commander Steven Lindsey is helped with his boot during suitup before heading to Launch Pad 39B and the third attempt at liftoff on mission STS-121. The launch of Space Shuttle Discovery on mission STS-121 is the 115th shuttle flight and the 18th U.S. flight to the International Space Station. During the 12-day mission, the STS-121 crew will test new equipment and procedures to improve shuttle safety, as well as deliver supplies and make repairs to the International Space Station. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. - During Crew Equipment Interface Test (CEIT) at NASA’s Kennedy Space Center, STS-121 crew members are testing the ergometer that will be used for exercising while in space. Seen in the photo are Mission Specialists Michael E. Fossum (left) and Piers J. Sellers. STS-121 is the second Return to Flight mission to the International Space Station. During CEIT, the crew has an opportunity to get a hands-on look at the orbiter and equipment they will be working with on their mission. Mission STS-121 is scheduled to launch aboard Space Shuttle Atlantis in July.

KENNEDY SPACE CENTER, FLA. - At Astrotech Space Operations in Titusville, Fla., the STS-121 crew poses for a photo. From left are Pilot Mark Kelly, Mission Commander Steven Lindsey, and Mission Specialists Lisa Nowak, Stephanie Wilson, Piers Sellers and Michael Fossum. The STS-121 crew is at KSC to take part in Crew Equipment Interface Test activities, which provide hands-on experience with equipment they will use on-orbit. STS-121, the second Return to Flight mission, is targeted for launch in a lighted planning window of Sept. 9 to Sept. 25.

KENNEDY SPACE CENTER, FLA. - In the Orbiter Processing Facility, the STS-121 crew receives a briefing and up-close look beneath Space Shuttle Atlantis, the orbiter that will take them into space. From left, in the blue flight suits, are Mission Specialists Stephanie D. Wilson, Piers J. Sellers, and Lisa M. Nowak; Commander Steven W. Lindsey and Pilot Mark E. Kelly. The astronauts of the second Return to Flight mission, STS-121, are at Kennedy Space Center to participate in the Crew Equipment Interface Test (CEIT). During CEIT, the crew has an opportunity to get a hands-on look at the orbiter and equipment they will be working with on their mission. Mission STS-121 is scheduled to launch in July.

KENNEDY SPACE CENTER, FLA. - During Crew Equipment Interface Test (CEIT) at NASA’s Kennedy Space Center, STS-121 crew members look at panel assemblies that hold laptop computers in place while in space. From left are Pilot Mark E. Kelly, Commander Steven W. Lindsey, and Mission Specialists Piers J. Sellers, Michael E. Fossum, Lisa Nowak and Stephanie Wilson. STS-121 is the second Return to Flight mission to the International Space Station. During CEIT, the crew has an opportunity to get a hands-on look at the orbiter and equipment they will be working with on their mission. Mission STS-121 is scheduled to launch aboard Space Shuttle Atlantis in July.

KENNEDY SPACE CENTER, FLA. - At Astrotech Space Operations in Titusville, Fla., STS-121 crew members look at equipment. From left are Pilot Mark Kelly, Mission Specialist Lisa Nowak, Mission Commander Steven Lindsey and Mission Specialist Stephanie Wilson. The STS-121 crew is at KSC to take part in Crew Equipment Interface Test activities, which provide hands-on experience with equipment they will use on-orbit. STS-121, the second Return to Flight mission, is targeted for launch in a lighted planning window of Sept. 9 to Sept. 25.

KENNEDY SPACE CENTER, FLA. - In the Orbiter Processing Facility, the STS-121 crew receives a briefing and up-close look at the handheld cameras they will carry into space. From left, in the blue flight suits, are Mission Specialists Piers J. Sellers and Lisa M. Nowak. The astronauts of the second Return to Flight mission, STS-121, are at Kennedy Space Center to participate in the Crew Equipment Interface Test (CEIT). During CEIT, the crew has an opportunity to get a hands-on look at the orbiter and equipment they will be working with on their mission. Mission STS-121 is scheduled to launch in July.

KENNEDY SPACE CENTER, FLA. - In the Orbiter Processing Facility, the STS-121 crew receives a briefing and up-close look beneath Space Shuttle Atlantis at the handheld cameras they will carry into space. From left, in the blue flight suits, are Mission Specialists Stephanie D. Wilson and Michael E. Fossum, Pilot Mark E. Kelly and Commander Steven W. Lindsey. The astronauts of the second Return to Flight mission, STS-121, are at Kennedy Space Center to participate in the Crew Equipment Interface Test (CEIT). During CEIT, the crew has an opportunity to get a hands-on look at the orbiter and equipment they will be working with on their mission. Mission STS-121 is scheduled to launch in July.

KENNEDY SPACE CENTER, FLA. - During Crew Equipment Interface Test (CEIT) at NASA’s Kennedy Space Center, STS-121 crew members are opening Window Shade bag for review. From left are Commander Steven W. Lindsey, Mission Specialist Michael E. Fossum and Pilot Mark E. Kelly. Behind them, at right, are Mission Specialists Piers J. Sellers and Stephanie Wilson. STS-121 is the second Return to Flight mission to the International Space Station. During CEIT, the crew has an opportunity to get a hands-on look at the orbiter and equipment they will be working with on their mission. Mission STS-121 is scheduled to launch aboard Space Shuttle Atlantis in July.

KENNEDY SPACE CENTER, FLA. - In the Orbiter Processing Facility, the STS-121 crew receives a briefing and up-close look beneath Space Shuttle Atlantis at the handheld cameras they will carry into space. From left, in the blue flight suits, are Mission Specialist Piers J. Sellers, Commander Steven W. Lindsey, Pilot Mark E. Kelly and Mission Specialist Michael E. Fossum. The astronauts of the second Return to Flight mission, STS-121, are at Kennedy Space Center to participate in the Crew Equipment Interface Test (CEIT). During CEIT, the crew has an opportunity to get a hands-on look at the orbiter and equipment they will be working with on their mission. Mission STS-121 is scheduled to launch in July.

KENNEDY SPACE CENTER, FLA. - In the Orbiter Processing Facility, the STS-121 crew receives a briefing and up-close look at the handheld cameras they will carry into space. From left are Mission Specialist Michael E. Fossum, Pilot Mark E. Kelly, Mission Specialists Piers J. Sellers and Lisa M. Nowak, and Commander Steven W. Lindsey. The astronauts of the second Return to Flight mission, STS-121, are at Kennedy Space Center to participate in the Crew Equipment Interface Test (CEIT). During CEIT, the crew has an opportunity to get a hands-on look at the orbiter and equipment they will be working with on their mission. Mission STS-121 is scheduled to launch in July.

KENNEDY SPACE CENTER, FLA. - During Crew Equipment Interface Test (CEIT) at NASA’s Kennedy Space Center, STS-121 crew members are testing the ergometer that will be used for exercising while in space. Seen in the photo are (center left) Commander Steven W. Lindsey and Mission Specialists Stephanie Wilson, Michael E. Fossum and Piers J. Sellers. STS-121 is the second Return to Flight mission to the International Space Station. During CEIT, the crew has an opportunity to get a hands-on look at the orbiter and equipment they will be working with on their mission. Mission STS-121 is scheduled to launch aboard Space Shuttle Atlantis in July.

KENNEDY SPACE CENTER, FLA. - STS-121 Commander Steven Lindsey takes his turn driving an M-113, which is an armored personnel carrier. The STS-121 crew is taking turns driving the M-113 as part of Terminal Countdown Demonstration Test activities, which include emergency egress training from the pad and a simulated countdown. Mission STS-121 is designated for launch on July 1. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. - STS-121 Mission Specialist Thomas Reiter is taking his turn driving an M-113, which is an armored personnel carrier. Reiter is from Germany and represents the European Space Agency. The STS-121 crew is taking turns driving the M-113 as part of Terminal Countdown Demonstration Test activities, which include emergency egress training from the pad and a simulated countdown. Mission STS-121 is designated for launch on July 1. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. - STS-121 Mission Specialist Michael Fossum takes his turn in an M-113, which is an armored personnel carrier. The STS-121 crew is taking turns driving the M-113 as part of Terminal Countdown Demonstration Test activities, which include emergency egress training from the pad and a simulated countdown. Mission STS-121 is designated for launch on July 1. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. - In the Space Station Processing Facility at NASA Kennedy Space Center, STS-121 Mission Specialists Piers Sellers (left) and Michael Fossum look at the Detailed Test Objective (DTO) tile sample repair kit situated on the Lightweight Multi-Purpose Experiment Support Structure Carrier (LMC). The STS-121 crew is at KSC to take part in Crew Equipment Interface Test activities, which provide hands-on experience with equipment they will use on-orbit. STS-121, the second Return to Flight mission, is targeted for launch in a lighted planning window of Sept. 9 to Sept. 25.

KENNEDY SPACE CENTER, FLA. - In the Space Station Processing Facility at NASA Kennedy Space Center, STS-121 Mission Specialist Piers Sellers (center) works with the Detailed Test Objective (DTO) tile sample repair kit situated on the Lightweight Multi-Purpose Experiment Support Structure Carrier (LMC). The STS-121 crew is at KSC to take part in Crew Equipment Interface Test activities, which provide hands-on experience with equipment they will use on-orbit. STS-121, the second Return to Flight mission, is targeted for launch in a lighted planning window of Sept. 9 to Sept. 25.

KENNEDY SPACE CENTER, FLA. - Inside the Orbiter Processing Facility bay 3 at NASA's Kennedy Space Center, members of the STS-121 crew take a close look at Discovery, the launch vehicle for the mission. Seen are Mission Specialist Stephanie Wilson and Pilot Mark Kelly. The crew is at Kennedy for the crew equipment interface test, which provides hands-on experience with equipment they will use on orbit. Launch of STS-121, the second return-to-flight mission, is scheduled for no earlier than May. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. - Inside the Orbiter Processing Facility bay 3 at NASA's Kennedy Space Center, members of the STS-121 crew take a close look at the wheels on Discovery, the launch vehicle for the mission. From left are Mission Specialists Michael Fossum and Piers Sellers. The crew is at Kennedy for the crew equipment interface test, which provides hands-on experience with equipment they will use on orbit. Launch of STS-121, the second return-to-flight mission, is scheduled for no earlier than May. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. - In the Space Station Processing Facility at NASA Kennedy Space Center, members of the STS-121 crew look at elements inside the Multi-Purpose Logistics Module Leonardo, which is part of the payload on the mission. The crew is at KSC to take part in Crew Equipment Interface Test activities, which provide hands-on experience with equipment they will use on-orbit. STS-121, the second Return to Flight mission, is targeted for launch in a lighted planning window of Sept. 9 to Sept. 25.

KENNEDY SPACE CENTER, FLA. - During Crew Equipment Interface Test (CEIT) in the Orbiter Processing Facility at NASA’s Kennedy Space Center, STS-121 crew members take a close look at equipment in the payload bay of Atlantis. The Airlock is in the center. During CEIT, the crew has an opportunity to get a hands-on look at the orbiter and equipment they will be working with on their mission. Mission STS-121 is scheduled to launch aboard Space Shuttle Atlantis in July.

KENNEDY SPACE CENTER, FLA. - In the Space Station Processing Facility at NASA Kennedy Space Center, members of the STS-121 crew look at the underside of the Multi-Purpose Logistics Module Leonardo, which is part of the payload on the mission. The crew is at KSC to take part in Crew Equipment Interface Test activities, which provide hands-on experience with equipment they will use on-orbit. STS-121, the second Return to Flight mission, is targeted for launch in a lighted planning window of Sept. 9 to Sept. 25.

KENNEDY SPACE CENTER, FLA. - Members of the STS-121 crew take part in Crew Equipment Interface Test activities in the Space Station Processing Facility at NASA Kennedy Space Center. Here they are looking at elements inside the the Multi-Purpose Logistics Module Leonardo, which is part of the payload on the mission. STS-121, the second Return to Flight mission, is targeted for launch in a lighted planning window of Sept. 9 to Sept. 25.

KENNEDY SPACE CENTER, FLA. - STS-121 Mission Commander Steven Lindsey talks to the media from the launch pad. He is in the landing area of the slidewire baskets. The crew is at Kennedy for Terminal Countdown Demonstration Test activities. Over several days, the crew will practice emergency egress from the pad and suit up in their orange flight suits for the simulated countdown to launch. Space Shuttle Discovery is designated to launch July 1 on mission STS-121. It will carry supplies to the International Space Station. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. - In NASA Kennedy Space Center's Orbiter Processing Facility bay 3, STS-121 Commander Steve Lindsey works with equipment that will be on the mission. The crew is at Kennedy to take part in the crew equipment interface test, which provides hands-on experience with equipment to be used on-orbit. Launch of Space Shuttle Discovery on mission STS-121, the second return-to-flight mission, is scheduled no earlier than May.

KENNEDY SPACE CENTER, FLA. - STS-121 Mission Specialist Michael Fossum has donned his launch and entry suit in preparation for the simulated countdown he and other crew members will undertake. The crew is taking part in Terminal Countdown Demonstration Test activities, including the dress rehearsal for launch. Mission STS-121 is scheduled to be launched July 1. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. - In NASA Kennedy Space Center's Orbiter Processing Facility bay 3, STS-121 Pilot Mark Kelly and Mission Specialist Stephanie Wilson are joined by two shuttle technicians as they examine the orbiter boom sensor system in Discovery's payload bay. The crew is at Kennedy to take part in the crew equipment interface test, which provides hands-on experience with equipment to be used on-orbit. Launch of Space Shuttle Discovery on mission STS-121, the second return-to-flight mission, is scheduled no earlier than May.

KENNEDY SPACE CENTER, FLA. - STS-121 Mission Specialist Stephanie Wilson signals all is well after donning her launch and entry suit in preparation for the simulated countdown she and other crew members will undertake. The crew is taking part in Terminal Countdown Demonstration Test activities, including the dress rehearsal for launch. Mission STS-121 is scheduled to be launched July 1. Photo credit: NASA/Kim Shiflett

STS121-S-066 (17 July 2006) --- Dr. Michael Griffin (left), NASA administrator, and Rex Geveden (right), associate administrator, talk with STS-121 crew members Michael E. Fossum (left), mission specialist; and Steven W. Lindsey, commander, after the landing of the Space Shuttle Discovery and conclusion of mission STS-121. The crew of seven tested new equipment and procedures to improve shuttle safety, as well as deliver supplies and make repairs to the International Space Station. Photo Credit: NASA/Bill Ingalls

KENNEDY SPACE CENTER, FLA. - STS-121 Mission Specialist Thomas Reiter wears his launch and entry suit in preparation for the simulated countdown he and other crew members will undertake. Reiter is from Germany and represents the European Space Agency. The crew is taking part in Terminal Countdown Demonstration Test activities, including the dress rehearsal for launch. Mission STS-121 is scheduled to be launched July 1. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. - During Crew Equipment Interface Test (CEIT) in the Orbiter Processing Facility at NASA’s Kennedy Space Center, STS-121 Mission Specialist Michael E. Fossum familiarizes himself with the Portable Foot Restraint on the forward bulkhead of Atlantis. The Airlock is in the center. During CEIT, the crew has an opportunity to get a hands-on look at the orbiter and equipment they will be working with on their mission. Mission STS-121 is scheduled to launch aboard Space Shuttle Atlantis in July.

KENNEDY SPACE CENTER, FLA. - Members of the STS-121 crew are at the SPACEHAB facility in Cape Canaveral to participate in a Crew Equipment Interface Test. On the top of the stand are Mission Specialists Piers Sellers (left) and Michael Fossum. This test allows the astronauts to become familiar with equipment they will be using on their upcoming mission. STS-121 is scheduled to launch in July aboard Space Shuttle Discovery. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. - In NASA Kennedy Space Center's Orbiter Processing Facility bay 3, STS-121 Commander Steve Lindsey inspects one of the windows that will fly on Space Shuttle Discovery during the mission. The crew is at Kennedy to take part in the crew equipment interface test, which provides hands-on experience with equipment to be used on-orbit. Launch of Space Shuttle Discovery on mission STS-121, the second return-to-flight mission, is scheduled no earlier than May.

KENNEDY SPACE CENTER, FLA. - In NASA Kennedy Space Center's Orbiter Processing Facility bay 3, STS-121 Pilot Mark Kelly and Mission Specialist Stephanie Wilson are joined by two shuttle technicians as they work with equipment that will be on the mission. The crew is at Kennedy to take part in the crew equipment interface test, which provides hands-on experience with equipment to be used on-orbit. Launch of Space Shuttle Discovery on mission STS-121, the second return-to-flight mission, is scheduled no earlier than May.

KENNEDY SPACE CENTER, FLA. - In NASA Kennedy Space Center's Orbiter Processing Facility bay 3, STS-121 Pilot Mark Kelly works with equipment that will be on the mission. The crew is at Kennedy to take part in the crew equipment interface test, which provides hands-on experience with equipment to be used on-orbit. Launch of Space Shuttle Discovery on mission STS-121, the second return-to-flight mission, is scheduled no earlier than May.

KENNEDY SPACE CENTER, FLA. - In NASA Kennedy Space Center's Orbiter Processing Facility bay 3, STS-121 Pilot Mark Kelly and Mission Specialist Stephanie Wilson work with equipment that will be on the mission. The crew is at Kennedy to take part in the crew equipment interface test, which provides hands-on experience with equipment to be used on-orbit. Launch of Space Shuttle Discovery on mission STS-121, the second return-to-flight mission, is scheduled no earlier than May.

KENNEDY SPACE CENTER, FLA. - In NASA Kennedy Space Center's Orbiter Processing Facility bay 3, STS-121 Pilot Mark Kelly and Mission Specialist Stephanie Wilson are joined by two shuttle technicians in Discovery's payload bay as they examine equipment that will be on the mission. The crew is at Kennedy to take part in the crew equipment interface test, which provides hands-on experience with equipment to be used on-orbit. Launch of Space Shuttle Discovery on mission STS-121, the second return-to-flight mission, is scheduled no earlier than May.

KENNEDY SPACE CENTER, FLA. - In NASA Kennedy Space Center's Orbiter Processing Facility bay 3, STS-121 Pilot Mark Kelly inspects one of the windows that will fly on Space Shuttle Discovery during the mission. The crew is at Kennedy to take part in the crew equipment interface test, which provides hands-on experience with equipment to be used on-orbit. Launch of Space Shuttle Discovery on mission STS-121, the second return-to-flight mission, is scheduled no earlier than May.

KENNEDY SPACE CENTER, FLA. - STS-121 Pilot Mark Kelly is helped with his glove after donning his launch and entry suit in preparation for the simulated countdown he and other crew members will undertake. The crew is taking part in Terminal Countdown Demonstration Test activities, including the dress rehearsal for launch. Mission STS-121 is scheduled to be launched July 1. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. - Members of the STS-121 crew pose with workers in the SPACEHAB facility in Cape Canaveral during the Crew Equipment Interface Test. The astronauts (in blue suits) are Mission Specialists Piers Sellers and Michael Fossum, Pilot Mark Kelly and Commander Steven Lindsey. This test allows the astronauts to become familiar with equipment they will be using on their upcoming mission. STS-121 is scheduled to launch in July aboard Space Shuttle Discovery. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. - In NASA Kennedy Space Center's Orbiter Processing Facility bay 3, STS-121 Mission Specialist Lisa Nowak prepares for her upcoming mission inside Space Shuttle Discovery. The crew is at Kennedy to take part in the crew equipment interface test, which provides hands-on experience with equipment to be used on-orbit. Launch of Space Shuttle Discovery on mission STS-121, the second return-to-flight mission, is scheduled no earlier than May.

KENNEDY SPACE CENTER, FLA. - STS-121 Commander Steven Lindsey has his helmet secured to his launch and entry suit in preparation for the simulated countdown he and other crew members will undertake. The crew is taking part in Terminal Countdown Demonstration Test activities, including the dress rehearsal for launch. Mission STS-121 is scheduled to be launched July 1. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. - At Astrotech Space Operations in Titusville, Fla., STS-121 Mission Specialist Lisa Nowak looks at an orbital replacement unit sitting on the Integrated Cargo Carrier. She and other crew members are at KSC to take part in Crew Equipment Interface Test activities, which provide hands-on experience with equipment they will use on-orbit. STS-121, the second Return to Flight mission, is targeted for launch in a lighted planning window of Sept. 9 to Sept. 25.

KENNEDY SPACE CENTER, FLA. - In NASA Kennedy Space Center's Orbiter Processing Facility bay 3, STS-121 Mission Specialist Piers Sellers practices using a piece of equipment that will be on the mission. The crew is at Kennedy to take part in the crew equipment interface test, which provides hands-on experience with equipment to be used on-orbit. Launch of Space Shuttle Discovery on mission STS-121, the second return-to-flight mission, is scheduled no earlier than May.

KENNEDY SPACE CENTER, FLA. - STS-121 Mission Specialist Lisa Nowak is helped with her boot after donning her launch and entry suit in preparation for the simulated countdown she and other crew members will undertake. The crew is taking part in Terminal Countdown Demonstration Test activities, including the dress rehearsal for launch. Mission STS-121 is scheduled to be launched July 1. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. - STS-121 Mission Specialist Piers Sellers signals okay after donning his launch and entry suit in preparation for the simulated countdown he and other crew members will undertake. The crew is taking part in Terminal Countdown Demonstration Test activities, including the dress rehearsal for launch. Mission STS-121 is scheduled to be launched July 1. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. - In NASA Kennedy Space Center's Orbiter Processing Facility bay 3, STS-121 Commander Steve Lindsey works with equipment that will be on the mission. The crew is at Kennedy to take part in the crew equipment interface test, which provides hands-on experience with equipment to be used on-orbit. Launch of Space Shuttle Discovery on mission STS-121, the second return-to-flight mission, is scheduled no earlier than May.

KENNEDY SPACE CENTER, FLA. - In NASA Kennedy Space Center's Orbiter Processing Facility bay 3, STS-121 Commander Steve Lindsey prepares for his upcoming mission inside Space Shuttle Discovery. The crew is at Kennedy to take part in the crew equipment interface test, which provides hands-on experience with equipment to be used on-orbit. Launch of Space Shuttle Discovery on mission STS-121, the second return-to-flight mission, is scheduled no earlier than May.

KENNEDY SPACE CENTER, FLA. - The plane carrying the crew of mission STS-121 taxis onto the Shuttle Landing Facility at NASA's Kennedy Space Center. The crew was at the Center for a three-day series of Terminal Countdown Demonstration Test (TCDT) activities. The TCDT includes equipment familiarization, emergency egress training and a simulated launch countdown. Mission STS-121 is scheduled to launch July 1. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. - In NASA Kennedy Space Center's Orbiter Processing Facility bay 3, STS-121 Pilot Mark Kelly and Mission Specialist Stephanie Wilson are joined by two shuttle technicians as they work with equipment that will be on the mission. The crew is at Kennedy to take part in the crew equipment interface test, which provides hands-on experience with equipment to be used on-orbit. Launch of Space Shuttle Discovery on mission STS-121, the second return-to-flight mission, is scheduled no earlier than May.

KENNEDY SPACE CENTER, FLA. - During Crew Equipment Interface Test (CEIT) in the Orbiter Processing Facility at NASA’s Kennedy Space Center, STS-121 Mission Specialist Michael E. Fossum familiarizes himself with the Portable Foot Restraint on the forward bulkhead of Atlantis. The Airlock is in the center. During CEIT, the crew has an opportunity to get a hands-on look at the orbiter and equipment they will be working with on their mission. Mission STS-121 is scheduled to launch aboard Space Shuttle Atlantis in July.

KENNEDY SPACE CENTER, FLA. - STS-121 Pilot Mark Kelly takes his turn in an M-113, which is an armored personnel carrier. Behind him can be seen Mission Specialists Lisa Nowak and Thomas Reiter from Germany, who represents the European Space Agency. The STS-121 crew is taking turns driving the M-113 as part of Terminal Countdown Demonstration Test activities, which include emergency egress training from the pad and a simulated countdown. Mission STS-121 is designated for launch on July 1. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. - STS-121 Mission Specialist Lisa Nowak is helped with her boot during suitup for a second launch attempt on Space Shuttle Discovery. The first launch attempt July 1 was scrubbed due to weather concerns and postponed 24 hours. The launch of Space Shuttle Discovery on mission STS-121 is the 115th shuttle flight and the 18th U.S. flight to the International Space Station. During the 12-day mission, the STS-121 crew will test new equipment and procedures to improve shuttle safety, as well as deliver supplies and make repairs to the International Space Station. Photo credit: NASA/Kim Shiflett

S121-E-07707 (15 July 2006) --- After almost nine days of cooperative work onboard the International Space Station and Space Shuttle Discovery, the STS-121 and Expedition 13 crews bid farewell to each other prior to the undocking of the two spacecraft. Pictured are astronauts Piers J. Sellers, STS-121 mission specialist; European Space Agency (ESA) astronaut Thomas Reiter, Expedition 13 flight engineer; Stephanie D. Wilson, STS-121 mission specialist; and cosmonaut Pavel V. Vinogradov, Expedition 13 commander representing Russia's Federal Space Agency. Undocking of the two spacecraft occurred at 5:08 a.m. (CDT) on July 15, 2006.