This nadir view of the STS-117 mission Space Shuttle Atlantis, taken by the Expedition 15 crew aboard the International Space Station (ISS), occurred just before the two spacecraft linked up in Earth orbit. Berthed in the cargo bay are the 17.8 ton second and third (S3 and S4) truss segments ready for installment. STS-117 mission objectives included the addition of S3 and S4 with Photovoltaic Radiator (PVR), the deployment of the third set of solar arrays, and the retraction of the P4 starboard solar array wing and one radiator.

S129-E-007199 (21 Nov. 2009) ---- The Canadarm2 or the Space Station Remote Manipulator System mates the Express Logistics Carrier (ELC) 2 to the Zenith / Outboard Payload Attachment System (PAS) on the S3 Truss aboard the International Space Station, as controlled by Atlantis and station crews in the shirt sleeve environment of the orbital outpost.

In the Space Station Processing Facility, workers attach an overhead crane to the S3/S4 integrated truss in order to move it to the payload canister. After it is stowed in the canister, the S3/S4 truss will be transported to the launch pad. The truss is the payload on mission STS-117, targeted for launch on March 15.

In the Space Station Processing Facility, an overhead crane settles the S3/S4 integrated truss into the payload canister. After it is stowed in the canister, the S3/S4 truss will be transported to the launch pad. The truss is the payload on mission STS-117, targeted for launch on March 15.

In the Space Station Processing Facility, an overhead crane moves the S3/S4 integrated truss to a payload canister. After it is stowed in the canister, the S3/S4 truss will be transported to the launch pad. The truss is the payload on mission STS-117, targeted for launch on March 15.

In the Space Station Processing Facility, an overhead crane lowers the S3/S4 integrated truss toward the open doors of the payload canister. After it is stowed in the canister, the S3/S4 truss will be transported to the launch pad. The truss is the payload on mission STS-117, targeted for launch on March 15.

In the Space Station Processing Facility, an overhead crane lowers the S3/S4 integrated truss into the open bay of the payload canister. After it is stowed in the canister, the S3/S4 truss will be transported to the launch pad. The truss is the payload on mission STS-117, targeted for launch on March 15.

In the Space Station Processing Facility, workers attach an overhead crane to the S3/S4 integrated truss in order to move it to the payload canister. After it is stowed in the canister, the S3/S4 truss will be transported to the launch pad. The truss is the payload on mission STS-117, targeted for launch on March 15.

s134e007533 (5/20/2011) --- View of the Alpha Magnetic Spectrometer - 2 (AMS-2) mounted on the S3 Truss segment. The EXPRESS (Expedite the Processing of Experiments to Space Station) Logistics Carrier 2 (ELC2) is also visible behind the AMS-2. Photo taken during STS-134 and Expedition 27 joint operations.

In the Space Station Processing Facility, an overhead crane moves the S3/S4 integrated truss above the floor to a payload canister. Several space station modules can be seen at various points on the floor. After it is stowed in the canister, the S3/S4 truss will be transported to the launch pad. The truss is the payload on mission STS-117, targeted for launch on March 15.

In the Space Station Processing Facility, an overhead crane moves the S3/S4 integrated truss above the floor to a payload canister. Several space station modules can be seen at various points on the floor. After it is stowed in the canister, the S3/S4 truss will be transported to the launch pad. The truss is the payload on mission STS-117, targeted for launch on March 15.

S117-E-07755 (17 June 2007) --- Astronaut Patrick Forrester, STS-117 mission specialist, participates in the mission's fourth and final session of extravehicular activity (EVA), as construction continues on the International Space Station. Among other tasks, Forrester and astronaut Steven Swanson (out of frame), mission specialist, continued activation of the station's new starboard 3 and 4 (S3/S4) truss segment; checked out the Drive Lock Assembly 2, one of two mechanisms that will drive rotation of the S3/S4 Truss Solar Alpha Rotary Joint (SARJ); and removed the final launch restraints on the SARJ.

S117-E-07789 (17 June 2007) --- Astronauts Patrick Forrester (left) and Steven Swanson, both STS-117 mission specialists, participate in the mission's fourth and final session of extravehicular activity (EVA), as construction continues on the International Space Station. Among other tasks, Forrester and Swanson continued activation of the station's new starboard 3 and 4 (S3/S4) truss segment; checked out the Drive Lock Assembly 2, one of two mechanisms that will drive rotation of the S3/S4 Truss Solar Alpha Rotary Joint (SARJ); and removed the final launch restraints on the SARJ.

S117-E-07735 (17 June 2007) --- Astronaut Steven Swanson, STS-117 mission specialist, participates in the mission's fourth and final session of extravehicular activity (EVA), as construction continues on the International Space Station. Among other tasks, Swanson and astronaut Patrick Forrester (out of frame), mission specialist, continued activation of the station's new starboard 3 and 4 (S3/S4) truss segment; checked out the Drive Lock Assembly 2, one of two mechanisms that will drive rotation of the S3/S4 Truss Solar Alpha Rotary Joint (SARJ); and removed the final launch restraints on the SARJ.

S117-E-07761 (17 June 2007) --- Astronaut Patrick Forrester, STS-117 mission specialist, participates in the mission's fourth and final session of extravehicular activity (EVA), as construction continues on the International Space Station. Among other tasks, Forrester and astronaut Steven Swanson (out of frame), mission specialist, continued activation of the station's new starboard 3 and 4 (S3/S4) truss segment; checked out the Drive Lock Assembly 2, one of two mechanisms that will drive rotation of the S3/S4 Truss Solar Alpha Rotary Joint (SARJ); and removed the final launch restraints on the SARJ.

S117-E-07749 (17 June 2007) --- Astronaut Steven Swanson, STS-117 mission specialist, participates in the mission's fourth and final session of extravehicular activity (EVA), as construction continues on the International Space Station. Among other tasks, Swanson and astronaut Patrick Forrester (out of frame), mission specialist, continued activation of the station's new starboard 3 and 4 (S3/S4) truss segment; checked out the Drive Lock Assembly 2, one of two mechanisms that will drive rotation of the S3/S4 Truss Solar Alpha Rotary Joint (SARJ); and removed the final launch restraints on the SARJ.

S117-E-07753 (17 June 2007) --- Astronaut Patrick Forrester, STS-117 mission specialist, participates in the mission's fourth and final session of extravehicular activity (EVA), as construction continues on the International Space Station. Among other tasks, Forrester and astronaut Steven Swanson (out of frame), mission specialist, continued activation of the station's new starboard 3 and 4 (S3/S4) truss segment; checked out the Drive Lock Assembly 2, one of two mechanisms that will drive rotation of the S3/S4 Truss Solar Alpha Rotary Joint (SARJ); and removed the final launch restraints on the SARJ.

S117-E-07772 (17 June 2007) --- Astronauts Patrick Forrester (right) and Steven Swanson, both STS-117 mission specialists, participate in the mission's fourth and final session of extravehicular activity (EVA), as construction continues on the International Space Station. Among other tasks, Forrester and Swanson continued activation of the station's new starboard 3 and 4 (S3/S4) truss segment; checked out the Drive Lock Assembly 2, one of two mechanisms that will drive rotation of the S3/S4 Truss Solar Alpha Rotary Joint (SARJ); and removed the final launch restraints on the SARJ.

S117-E-07790 (17 June 2007) --- Astronauts Patrick Forrester (left) and Steven Swanson, both STS-117 mission specialists, participate in the mission's fourth and final session of extravehicular activity (EVA), as construction continues on the International Space Station. Among other tasks, Forrester and Swanson continued activation of the station's new starboard 3 and 4 (S3/S4) truss segment; checked out the Drive Lock Assembly 2, one of two mechanisms that will drive rotation of the S3/S4 Truss Solar Alpha Rotary Joint (SARJ); and removed the final launch restraints on the SARJ.

S134-E-009255 (19 May 2011) --- One of the STS-134 crew members recorded this high angle view of the starboard side truss segments on the International Space Station. The Alpha Magnetic Spectrometer (AMS-02) is being installed on the S3 truss segment next to the ExPRESS Logistics Carrier (ELC2). The AMS is still grappled by the Space Station Remote Manipulator System (Canadarm2), which is attached to the Mobile Transporter. Photo credit: NASA

At the Shuttle Landing Facility, cranes position the Integrated Truss Structure S3 onto a flatbed trailer for transport to the Operations and Checkout Building. The S3 arrived aboard a Super Guppy aircraft. The second starboard truss segment of the International Space Station, the S3 truss is scheduled to be added to the Station in April 2003

A Super Guppy aircraft arrives at the KSC Shuttle Landing Facility with its cargo of Integrated Truss Structure S3, built by The Boeing Co. After offloading, the S3 will be transported to the Operations and Checkout Building. The second starboard truss segment of the International Space Station, the S3 truss is scheduled to be added to the Station in April 2003

A Super Guppy aircraft arrives at the KSC Shuttle Landing Facility with its cargo of Integrated Truss Structure S3, built by The Boeing Co. After offloading, the S3 will be transported to the Operations and Checkout Building. The second starboard truss segment of the International Space Station, the S3 truss is scheduled to be added to the Station in April 2003

The Integrated Truss Structure S3 is offloaded from the Super Guppy aircraft that brought it to KSC from Tulsa, Okla. The S3 is built by The Boeing Co. The truss will be transported to the Operations and Checkout Building. The second starboard truss segment of the International Space Station, the S3 truss is scheduled to be added to the Station in April 2003

The Integrated Truss Structure S3 is offloaded from the Super Guppy aircraft that brought it to KSC from Tulsa, Okla. The S3 is built by The Boeing Co. The truss will be transported to the Operations and Checkout Building. The second starboard truss segment of the International Space Station, the S3 truss is scheduled to be added to the Station in April 2003

A flatbed trailer begins moving the Integrated Truss Structure S3 from the Shuttle Landing Facility to the Operations and Checkout Building. The S3 arrived aboard a Super Guppy aircraft. The second starboard truss segment of the International Space Station, the S3 truss is scheduled to be added to the Station in April 2003

This week, NASA is taking preliminary steps to resume @NASA_SLS core stage production. Limited crews will return to #NASAMichoud to perform critical work essential to the agency's #Artemis program and our return to the Moon.

This week, NASA is taking preliminary steps to resume @NASA_SLS core stage production. Limited crews will return to #NASAMichoud to perform critical work essential to the agency's #Artemis program and our return to the Moon.

This week, NASA is taking preliminary steps to resume @NASA_SLS core stage production. Limited crews will return to #NASAMichoud to perform critical work essential to the agency's #Artemis program and our return to the Moon.

This week, NASA is taking preliminary steps to resume @NASA_SLS core stage production. Limited crews will return to #NASAMichoud to perform critical work essential to the agency's #Artemis program and our return to the Moon.

This week, NASA is taking preliminary steps to resume @NASA_SLS core stage production. Limited crews will return to #NASAMichoud to perform critical work essential to the agency's #Artemis program and our return to the Moon.

This week, NASA is taking preliminary steps to resume @NASA_SLS core stage production. Limited crews will return to #NASAMichoud to perform critical work essential to the agency's #Artemis program and our return to the Moon.

This week, NASA is taking preliminary steps to resume @NASA_SLS core stage production. Limited crews will return to #NASAMichoud to perform critical work essential to the agency's #Artemis program and our return to the Moon.

On the parking apron of the KSC Shuttle Landing Facility, the Integrated Truss Structure S3 moves out from inside the Super Guppy aircraft that brought it to KSC from Tulsa, Okla. After offloading, the S3 will be transported to the Operations and Checkout Building. The second starboard truss segment of the International Space Station, the S3 truss is scheduled to be added to the Station in April 2003

On the parking apron of the KSC Shuttle Landing Facility, the Integrated Truss Structure S3 moves out from inside the Super Guppy aircraft that brought it to KSC from Tulsa, Okla. After offloading, the S3 will be transported to the Operations and Checkout Building. The second starboard truss segment of the International Space Station, the S3 truss is scheduled to be added to the Station in April 2003

On the parking apron of the KSC Shuttle Landing Facility, near the Mate/Demate device (seen in the foreground), the opened nose of the Super Guppy aircraft reveals its cargo, the Integrated Truss Structure S3. It was built by The Boeing Co. After offloading, the S3 will be transported to the Operations and Checkout Building. The second starboard truss segment of the International Space Station, the S3 truss is scheduled to be added to the Station in April 2003

On the parking apron of the KSC Shuttle Landing Facility, near the Mate/Demate device (seen in the foreground), the opened nose of the Super Guppy aircraft reveals its cargo, the Integrated Truss Structure S3. It was built by The Boeing Co. After offloading, the S3 will be transported to the Operations and Checkout Building. The second starboard truss segment of the International Space Station, the S3 truss is scheduled to be added to the Station in April 2003

On the parking apron of the Shuttle Landing Facility, workers check the overhead cranes that will move the Integrated Truss Structure S3 to a transporter. The truss will be taken to the Operations and Checkout Building. The second starboard truss segment of the International Space Station, the S3 truss is scheduled to be added to the Station in April 2003

KENNEDY SPACE CENTER, FLA. -- In the Space Station Processing Facility, an overhead crane moves the S3/S4 integrated truss to a payload canister. After it is stowed in the canister, the S3/S4 truss will be transported to the launch pad. The truss is the payload on mission STS-117, targeted for launch on March 15. Photo credit: NASA/George Shelton

KENNEDY SPACE CENTER, FLA. -- In the Space Station Processing Facility, an overhead crane settles the S3/S4 integrated truss into the payload canister. After it is stowed in the canister, the S3/S4 truss will be transported to the launch pad. The truss is the payload on mission STS-117, targeted for launch on March 15. Photo credit: NASA/George Shelton

The Integrated Truss Structure S3 waits on the parking apron of the Shuttle Landing Facility after being offloaded from the Super Guppy aircraft in the background. The truss will be moved to a transporter and taken to the Operations and Checkout Building. The second starboard truss segment of the International Space Station, the S3 truss is scheduled to be added to the Station in April 2003

At the Shuttle Landing Facility, a worker attaches one of the cranes to the Integrated Truss Structure S3. Cranes will lift and move the truss to a transporter and take it to the Operations and Checkout Building. The second starboard truss segment of the International Space Station, the S3 truss is scheduled to be added to the Station in April 2003

S3 VIKING NAVY JET AIRPLANE ON THE TARMAC AT NASA GLENN RESEARCH CENTER

The S3 Move Crew holds a team tag up prior to loading the Intertank STA on the Pegasus Barge.

KENNEDY SPACE CENTER, FLA. -- In the Space Station Processing Facility, an overhead crane moves the S3/S4 integrated truss above the floor to a payload canister. Several space station modules can be seen at various points on the floor. After it is stowed in the canister, the S3/S4 truss will be transported to the launch pad. The truss is the payload on mission STS-117, targeted for launch on March 15. Photo credit: NASA/George Shelton

KENNEDY SPACE CENTER, FLA. -- In the Space Station Processing Facility, workers attach an overhead crane to the S3/S4 integrated truss in order to move it to the payload canister. After it is stowed in the canister, the S3/S4 truss will be transported to the launch pad. The truss is the payload on mission STS-117, targeted for launch on March 15. Photo credit: NASA/George Shelton

KENNEDY SPACE CENTER, FLA. -- In the Space Station Processing Facility, workers attach an overhead crane to the S3/S4 integrated truss in order to move it to the payload canister. After it is stowed in the canister, the S3/S4 truss will be transported to the launch pad. The truss is the payload on mission STS-117, targeted for launch on March 15. Photo credit: NASA/George Shelton

KENNEDY SPACE CENTER, FLA. -- In the Space Station Processing Facility, an overhead crane lifts the S3/S4 integrated truss from its workstand in order to move it to the payload canister. After it is stowed in the canister, the S3/S4 truss will be transported to the launch pad. The truss is the payload on mission STS-117, targeted for launch on March 15. Photo credit: NASA/George Shelton

KENNEDY SPACE CENTER, FLA. -- In the Space Station Processing Facility, an overhead crane lowers the S3/S4 integrated truss into the open bay of the payload canister. After it is stowed in the canister, the S3/S4 truss will be transported to the launch pad. The truss is the payload on mission STS-117, targeted for launch on March 15. Photo credit: NASA/George Shelton

KENNEDY SPACE CENTER, FLA. -- In the Space Station Processing Facility, an overhead crane moves the S3/S4 integrated truss toward the open doors of the payload canister. After it is stowed in the canister, the S3/S4 truss will be transported to the launch pad. The truss is the payload on mission STS-117, targeted for launch on March 15. Photo credit: NASA/George Shelton

KENNEDY SPACE CENTER, FLA. -- In the Space Station Processing Facility, an overhead crane lowers the S3/S4 integrated truss toward the open doors of the payload canister. After it is stowed in the canister, the S3/S4 truss will be transported to the launch pad. The truss is the payload on mission STS-117, targeted for launch on March 15. Photo credit: NASA/George Shelton

KENNEDY SPACE CENTER, FLA. -- In the Space Station Processing Facility, an overhead crane lowers the S3/S4 integrated truss into the open bay of the payload canister. After it is stowed in the canister, the S3/S4 truss will be transported to the launch pad. The truss is the payload on mission STS-117, targeted for launch on March 15. Photo credit: NASA/George Shelton

In the Space Station Processing Facility, the S3/S4 integrated truss segment is on display for the media. The starboard 3/4 truss segment will launch aboard Space Shuttle Atlantis on mission STS-117, targeted for March 15. The element will be added to the 11-segment integrated truss structure, the station's backbone. The integrated truss structure eventually will span more than 300 feet. The S3/S4 truss has two large solar arrays and will provide one-fourth of the total power generation for the completed station.

KENNEDY SPACE CENTER, FLA. -- In the Space Station Processing Facility, an overhead crane moves the S3/S4 integrated truss above the floor to a payload canister. Several space station modules can be seen at various points on the floor. After it is stowed in the canister, the S3/S4 truss will be transported to the launch pad. The truss is the payload on mission STS-117, targeted for launch on March 15. Photo credit: NASA/George Shelton

Cranes move toward the Integrated Truss Structure S3 as it sits on the parking apron of the Shuttle Landing Facility after being offloaded from the Super Guppy aircraft. The truss will be moved to a transporter and taken to the Operations and Checkout Building. The second starboard truss segment of the International Space Station, the S3 truss is scheduled to be added to the Station in April 2003

KENNEDY SPACE CENTER, FLA. -- After their arrival at KSC, STS-117 crew members take part in a payload bay walkdown on Launch Pad 39A to look at the cargo in Space Shuttle Atlantis. The payload includes the S3/S4 integrated truss structure for the International Space Station. The payload includes the S3/S4 integrated truss structure for the International Space Station. STS-117 is scheduled to launch at 7:38 p.m. June 8. During the 11-day mission and three spacewalks, the crew will work with flight controllers at NASA's Johnson Space Center in Houston to install the 17-ton segment on the station's girder-like truss and deploy the set of solar arrays, S3/S4. The mission will increase the space station's power capability in preparation for the arrival of new science modules from the European and Japanese space agencies. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. -- After their arrival at KSC, STS-117 crew members take part in a payload bay walkdown on Launch Pad 39A to look at the cargo in Space Shuttle Atlantis. Seen here are Mission Specialists Patrick Forrester (left) and James Reilly. The payload includes the S3/S4 integrated truss structure for the International Space Station. The payload includes the S3/S4 integrated truss structure for the International Space Station. STS-117 is scheduled to launch at 7:38 p.m. June 8. During the 11-day mission and three spacewalks, the crew will work with flight controllers at NASA's Johnson Space Center in Houston to install the 17-ton segment on the station's girder-like truss and deploy the set of solar arrays, S3/S4. The mission will increase the space station's power capability in preparation for the arrival of new science modules from the European and Japanese space agencies. Photo credit: NASA/Kim Shiflett

iss036e004042 (5/24/2013) --- View of Materials on International Space Station Experiment - 8 (MISSE-8) which is installed on the ExPRESS Logistics Carrier 2 (ELC-2),located on the S3 Truss Outboard Zenith site.

JSC2006-E-38951 (August 2006) --- Computer generated graphic of the International Space Station configuration after STS-117/13A with the addition of S3/S4 integrated truss segments.

KENNEDY SPACE CENTER, FLA. -- In the Space Station Processing Facility, STS-117 Mission Specialist James Reilly (right) discusses the S3/S4 Integrated Truss Segment with a technician during Crew Equipment Interface Test (CEIT) activities. A CEIT provides the astronauts opportunities to become familiar with equipment and hardware with which they will be working during their mission. The crew of mission STS-117 will deliver and install the second and third starboard truss segments (S3/S4) and another pair of solar arrays and batteries during the Space Shuttle Program's 21st mission to the International Space Station. Launch of Space Shuttle Atlantis is scheduled for March 2007. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. -- In the Space Station Processing Facility, photographers take advantage of a media showcase to get photos of the S3/S4 integrated truss segment. The starboard 3/4 truss segment will launch aboard Space Shuttle Atlantis on mission STS-117, targeted for March 15. The element will be added to the 11-segment integrated truss structure, the station's backbone. The integrated truss structure eventually will span more than 300 feet. The S3/S4 truss has two large solar arrays and will provide one-fourth of the total power generation for the completed station. Photo credit: NASA/George Shelton

KENNEDY SPACE CENTER, FLA. -- In the Space Station Processing Facility, STS-117 Mission Specialist Steven Swanson looks under the protective wrapping at the S3/S4 starboard integrated truss segment that is part of the payload on the mission. He and other crew members are at KSC to take part in a Crew Equipment Interface Test that allows them opportunities to become familiar with equipment and hardware for their mission. STS-117 will deliver the S3/S4 and another pair of solar arrays to the space station. The 21st shuttle mission to the International Space Station, STS-117 is scheduled to launch no earlier than March 16. Photo credit: NASA/Kim Shiflett

At a media showcase in the Space Station Processing Facility, reporters and photographers get a close look at the S3/S4 integrated truss segment. The starboard 3/4 truss segment will launch aboard Space Shuttle Atlantis on mission STS-117, targeted for March 15. The element will be added to the 11-segment integrated truss structure, the station's backbone. The integrated truss structure eventually will span more than 300 feet. The S3/S4 truss has two large solar arrays and will provide one-fourth of the total power generation for the completed station.

S117-E-07827 (17 June 2007) --- Astronaut Patrick Forrester, STS-117 mission specialist, participates in the mission's fourth and final session of extravehicular activity (EVA), as construction continues on the International Space Station. Among other tasks, Forrester and astronaut Steven Swanson (out of frame), mission specialist, continued activation of the station's new starboard 3 and 4 (S3/S4) truss segment; checked out the Drive Lock Assembly 2, one of two mechanisms that will drive rotation of the S3/S4 Truss Solar Alpha Rotary Joint (SARJ); and removed the final launch restraints on the SARJ.

KENNEDY SPACE CENTER, FLA. -- In the Space Station Processing Facility, the S3/S4 integrated truss segment is on display for the media. The starboard 3/4 truss segment will launch aboard Space Shuttle Atlantis on mission STS-117, targeted for March 15. The element will be added to the 11-segment integrated truss structure, the station's backbone. The integrated truss structure eventually will span more than 300 feet. The S3/S4 truss has two large solar arrays and will provide one-fourth of the total power generation for the completed station. Photo credit: NASA/George Shelton

KENNEDY SPACE CENTER, FLA. -- In the Space Station Processing Facility, a technician points out elements of the S3/S4 Integrated Truss Segment to STS-117 Mission Specialist James Reilly (right) during Crew Equipment Interface Test (CEIT) activities. A CEIT provides the astronauts opportunities to become familiar with equipment and hardware with which they will be working during their mission. The crew of mission STS-117 will deliver and install the second and third starboard truss segments (S3/S4) and another pair of solar arrays and batteries during the Space Shuttle Program's 21st mission to the International Space Station. Launch of Space Shuttle Atlantis is scheduled for March 2007. Photo credit: NASA/Kim Shiflett

S117-E-07822 (17 June 2007) --- Astronaut Patrick Forrester, STS-117 mission specialist, participates in the mission's fourth and final session of extravehicular activity (EVA), as construction continues on the International Space Station. Among other tasks, Forrester and astronaut Steven Swanson (out of frame), mission specialist, continued activation of the station's new starboard 3 and 4 (S3/S4) truss segment; checked out the Drive Lock Assembly 2, one of two mechanisms that will drive rotation of the S3/S4 Truss Solar Alpha Rotary Joint (SARJ); and removed the final launch restraints on the SARJ.

S117-E-07829 (17 June 2007) --- Astronaut Patrick Forrester, STS-117 mission specialist, participates in the mission's fourth and final session of extravehicular activity (EVA), as construction continues on the International Space Station. Among other tasks, Forrester and astronaut Steven Swanson (out of frame), mission specialist, continued activation of the station's new starboard 3 and 4 (S3/S4) truss segment; checked out the Drive Lock Assembly 2, one of two mechanisms that will drive rotation of the S3/S4 Truss Solar Alpha Rotary Joint (SARJ); and removed the final launch restraints on the SARJ.

At a media showcase in the Space Station Processing Facility, reporters and photographers get a close look at the S3/S4 integrated truss segment. The starboard 3/4 truss segment will launch aboard Space Shuttle Atlantis on mission STS-117, targeted for March 15. The element will be added to the 11-segment integrated truss structure, the station's backbone. The integrated truss structure eventually will span more than 300 feet. The S3/S4 truss has two large solar arrays and will provide one-fourth of the total power generation for the completed station.

STS-117 astronauts and mission specialists Jim Reilly (center frame), and John “Danny” Olivas (bottom center), participated in the first Extra Vehicular Activity (EVA) as construction resumed on the International Space Station (ISS). Among other tasks, the two connected power, data, and cooling cables between trusses 1 (S1) and 3 (S3), released the launch restraints from and deployed the four solar array blanket boxes on S4, and released the cinches and winches holding the photovoltaic radiator on S4. The primary mission objective was the installment of the second and third starboard truss segments (S3 and S4).

S117-E-07726 (17 June 2007) --- Astronaut Patrick Forrester, STS-117 mission specialist, participates in the mission's fourth and final session of extravehicular activity (EVA), as construction continues on the International Space Station. Among other tasks, Forrester and astronaut Steven Swanson (out of frame), mission specialist, continued activation of the station's new starboard 3 and 4 (S3/S4) truss segment; checked out the Drive Lock Assembly 2, one of two mechanisms that will drive rotation of the S3/S4 Truss Solar Alpha Rotary Joint (SARJ); and removed the final launch restraints on the SARJ.

In the Space Station Processing Facility, photographers take advantage of a media showcase to get photos of the S3/S4 integrated truss segment. The starboard 3/4 truss segment will launch aboard Space Shuttle Atlantis on mission STS-117, targeted for March 15. The element will be added to the 11-segment integrated truss structure, the station's backbone. The integrated truss structure eventually will span more than 300 feet. The S3/S4 truss has two large solar arrays and will provide one-fourth of the total power generation for the completed station.

KENNEDY SPACE CENTER, FLA. -- At a media showcase in the Space Station Processing Facility, reporters and photographers get a close look at the S3/S4 integrated truss segment. The starboard 3/4 truss segment will launch aboard Space Shuttle Atlantis on mission STS-117, targeted for March 15. The element will be added to the 11-segment integrated truss structure, the station's backbone. The integrated truss structure eventually will span more than 300 feet. The S3/S4 truss has two large solar arrays and will provide one-fourth of the total power generation for the completed station. Photo credit: NASA/George Shelton

S117-E-07818 (17 June 2007) --- Astronaut Patrick Forrester, STS-117 mission specialist, participates in the mission's fourth and final session of extravehicular activity (EVA), as construction continues on the International Space Station. Among other tasks, Forrester and astronaut Steven Swanson (out of frame), mission specialist, continued activation of the station's new starboard 3 and 4 (S3/S4) truss segment; checked out the Drive Lock Assembly 2, one of two mechanisms that will drive rotation of the S3/S4 Truss Solar Alpha Rotary Joint (SARJ); and removed the final launch restraints on the SARJ.

KENNEDY SPACE CENTER, FLA. -- At a media showcase in the Space Station Processing Facility, reporters and photographers get a close look at the S3/S4 integrated truss segment. The starboard 3/4 truss segment will launch aboard Space Shuttle Atlantis on mission STS-117, targeted for March 15. The element will be added to the 11-segment integrated truss structure, the station's backbone. The integrated truss structure eventually will span more than 300 feet. The S3/S4 truss has two large solar arrays and will provide one-fourth of the total power generation for the completed station. Photo credit: NASA/George Shelton

KENNEDY SPACE CENTER, FLA. -- In the Space Station Processing Facility, STS-117 Mission Specialist James Reilly examines the S3/S4 Integrated Truss Segment during Crew Equipment Interface Test (CEIT) activities. A CEIT provides the astronauts opportunities to become familiar with equipment and hardware with which they will be working during their mission. The crew of mission STS-117 will deliver and install the second and third starboard truss segments (S3/S4) and another pair of solar arrays and batteries during the Space Shuttle Program's 21st mission to the International Space Station. Launch of Space Shuttle Atlantis is scheduled for March 2007. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. - In a brief ceremony in the Space Station Processing Facility, Chuck Hardison (left), Boeing senior truss manager, turns over the “key” for the starboard truss segment S3/S4 to Scott Gahring, ISS Vehicle Office manager (acting), Johnson Space Center. The trusses are scheduled to be delivered to the International Space Station on mission STS-117.

S117-E-07892 (18 June 2007) --- The International Space Station's Canadarm2, or Space Station Remote Manipulator System (SSRMS) and solar array wings are featured in this image photographed by a crewmember on the station while Space Shuttle Atlantis was docked with the orbital complex. The blackness of space and Earth's horizon provides the backdrop for the scene.

S117-E-07888 (18 June 2007) --- The International Space Station's Canadarm2, or Space Station Remote Manipulator System (SSRMS) and solar array wings are featured in this image photographed by a crewmember on the station while Space Shuttle Atlantis was docked with the orbital complex. The blackness of space and Earth's horizon provides the backdrop for the scene.

S134-E-007532 (20 May 2011) --- The starboard truss of the International Space Station is featured in this image photographed by an STS-134 crew member while space shuttle Endeavour remains docked with the station. The newly-installed Alpha Magnetic Spectrometer-2 (AMS) is visible at center left. The blackness of space and Earth?s horizon provide the backdrop for the scene. Photo credit: NASA

JSC2006-E-43500 (October 2006) --- Computer-generated artist's rendering of the International Space Station after flight STS-117/13A. Second starboard truss segment (S3/S4) is delivered and installed. The third set of solar arrays is deployed. P6 starboard solar array wing and one radiator are retracted.

KENNEDY SPACE CENTER, FLA. -- With umbilical lines still attached, the payload canister is lifted up to the payload changeout room on the rotating service structure (RSS) on Launch Pad 39A The canister contains the S3/S4 integrated truss for mission STS-117 to the International Space Station aboard Space Shuttle Atlantis. Once inside the PCR, the S3/S4 arrays will be transferred into Space Shuttle Atlantis' payload bay after the vehicle has rolled out to the pad. The changeout room is the enclosed, environmentally controlled portion of the RSS that supports cargo delivery to the pad and subsequent vertical installation into the orbiter payload bay. The Atlantis crew will install the new truss segment, retract a set of solar arrays and unfold a new set on the starboard side of the station. Launch is targeted for March 15. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. -- With umbilical lines still attached, the payload canister is lifted up to the payload changeout room on the rotating service structure (RSS) on Launch Pad 39A The canister contains the S3/S4 integrated truss for mission STS-117 to the International Space Station aboard Space Shuttle Atlantis. Once inside the PCR, the S3/S4 arrays will be transferred into Space Shuttle Atlantis' payload bay after the vehicle has rolled out to the pad. The changeout room is the enclosed, environmentally controlled portion of the RSS that supports cargo delivery to the pad and subsequent vertical installation into the orbiter payload bay. The Atlantis crew will install the new truss segment, retract a set of solar arrays and unfold a new set on the starboard side of the station. Launch is targeted for March 15. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. -- After their arrival at KSC, STS-117 crew members take part in a payload bay walkdown on Launch Pad 39A to look at the cargo in Space Shuttle Atlantis. The payload includes the S3/S4 integrated truss structure for the International Space Station. STS-117 is scheduled to launch at 7:38 p.m. June 8. During the 11-day mission and three spacewalks, the crew will work with flight controllers at NASA's Johnson Space Center in Houston to install the 17-ton segment on the station's girder-like truss and deploy the set of solar arrays, S3/S4. The mission will increase the space station's power capability in preparation for the arrival of new science modules from the European and Japanese space agencies. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. -- The payload canister on its transporter sits beneath the payload changeout room on the rotating service structure (RSS) on Launch Pad 39A. The canister contains the S3/S4 integrated truss for mission STS-117 to the International Space Station aboard Space Shuttle Atlantis. Once inside the PCR, the S3/S4 arrays will be transferred into Space Shuttle Atlantis' payload bay after the vehicle has rolled out to the pad. The changeout room is the enclosed, environmentally controlled portion of the RSS that supports cargo delivery to the pad and subsequent vertical installation into the orbiter payload bay. The Atlantis crew will install the new truss segment, retract a set of solar arrays and unfold a new set on the starboard side of the station. Launch is targeted for March 15. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. -- After their arrival at KSC, STS-117 crew members take part in a payload bay walkdown on Launch Pad 39A to look at the cargo in Space Shuttle Atlantis. Seen here is Mission Specialist Patrick Forrester. The payload includes the S3/S4 integrated truss structure for the International Space Station. STS-117 is scheduled to launch at 7:38 p.m. June 8. During the 11-day mission and three spacewalks, the crew will work with flight controllers at NASA's Johnson Space Center in Houston to install the 17-ton segment on the station's girder-like truss and deploy the set of solar arrays, S3/S4. The mission will increase the space station's power capability in preparation for the arrival of new science modules from the European and Japanese space agencies. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. -- With umbilical lines still attached, the payload canister is lifted up to the payload changeout room on the rotating service structure (RSS) on Launch Pad 39A The canister contains the S3/S4 integrated truss for mission STS-117 to the International Space Station aboard Space Shuttle Atlantis. Once inside the PCR, the S3/S4 arrays will be transferred into Space Shuttle Atlantis' payload bay after the vehicle has rolled out to the pad. The changeout room is the enclosed, environmentally controlled portion of the RSS that supports cargo delivery to the pad and subsequent vertical installation into the orbiter payload bay. The Atlantis crew will install the new truss segment, retract a set of solar arrays and unfold a new set on the starboard side of the station. Launch is targeted for March 15. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. -- After their arrival at KSC, STS-117 crew members take part in a payload bay walkdown on Launch Pad 39A to look at the cargo in Space Shuttle Atlantis. In the bucket are Mission Specialists Patrick Forrester (with camera) and Steven Swanson (far right). The payload includes the S3/S4 integrated truss structure for the International Space Station. STS-117 is scheduled to launch at 7:38 p.m. June 8. During the 11-day mission and three spacewalks, the crew will work with flight controllers at NASA's Johnson Space Center in Houston to install the 17-ton segment on the station's girder-like truss and deploy the set of solar arrays, S3/S4. The mission will increase the space station's power capability in preparation for the arrival of new science modules from the European and Japanese space agencies. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. -- After their arrival at KSC, STS-117 crew members take part in a payload bay walkdown on Launch Pad 39A to look at the cargo in Space Shuttle Atlantis. The payload includes the S3/S4 integrated truss structure for the International Space Station. STS-117 is scheduled to launch at 7:38 p.m. June 8. During the 11-day mission and three spacewalks, the crew will work with flight controllers at NASA's Johnson Space Center in Houston to install the 17-ton segment on the station's girder-like truss and deploy the set of solar arrays, S3/S4. The mission will increase the space station's power capability in preparation for the arrival of new science modules from the European and Japanese space agencies. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. -- After their arrival at KSC, STS-117 crew members take part in a payload bay walkdown on Launch Pad 39A to look at the cargo in Space Shuttle Atlantis. The payload includes the S3/S4 integrated truss structure for the International Space Station. STS-117 is scheduled to launch at 7:38 p.m. June 8. During the 11-day mission and three spacewalks, the crew will work with flight controllers at NASA's Johnson Space Center in Houston to install the 17-ton segment on the station's girder-like truss and deploy the set of solar arrays, S3/S4. The mission will increase the space station's power capability in preparation for the arrival of new science modules from the European and Japanese space agencies. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. -- The payload canister on its transporter arrives on Launch Pad 39A, stopping beneath the payload changeout room on the rotating service structure (RSS). The canister contains the S3/S4 integrated truss for mission STS-117 to the International Space Station aboard Space Shuttle Atlantis. Once inside the PCR, the S3/S4 arrays will be transferred into Space Shuttle Atlantis' payload bay after the vehicle has rolled out to the pad. The changeout room is the enclosed, environmentally controlled portion of the RSS that supports cargo delivery to the pad and subsequent vertical installation into the orbiter payload bay.The Atlantis crew will install the new truss segment, retract a set of solar arrays and unfold a new set on the starboard side of the station. Launch is targeted for March 15. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. -- After their arrival at KSC, STS-117 crew members take part in a payload bay walkdown on Launch Pad 39A to look at the cargo in Space Shuttle Atlantis. Seen here are Mission Specialists Patrick Forrester (left) and James Reilly. The payload includes the S3/S4 integrated truss structure for the International Space Station. STS-117 is scheduled to launch at 7:38 p.m. June 8. During the 11-day mission and three spacewalks, the crew will work with flight controllers at NASA's Johnson Space Center in Houston to install the 17-ton segment on the station's girder-like truss and deploy the set of solar arrays, S3/S4. The mission will increase the space station's power capability in preparation for the arrival of new science modules from the European and Japanese space agencies. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. - In the Space Station Processing Facility, an overhead crane is being attached to the S3/S4 integrated truss structure in order to move it from a rotation stand to a work stand. Along with a third set of solar arrays and batteries, the truss is scheduled to fly on mission STS-117 aboard Space Shuttle Atlantis to the International Space Station. The crew of six astronauts will install the truss to continue assembly of the station. Photo credit: NASA/Dimitri Gerondidakis

ISS015-E-11706 (10 June 2007) --- A nadir view of the Space Shuttle Atlantis was photographed by a member of the Expedition 15 crew aboard the International Space Station as the two spacecraft were nearing their much-anticipated link-up in Earth orbit. The 17.8 ton S3/S4 truss to be added next week to the station can be seen berthed in the payload bay of the shuttle.

iss057e055460 (10/22/2018) --- View of the Neutron Star Interior Composition ExploreR (NICER) payload, attached to ExPRESS (Expedite the Processing of Experiments to Space Station) Logistics Carrier-2 (ELC-2) on the S3 Truss. Photo was taken by the ground-controlled External High Definition Camera 1 (EHDC1). NICER's primary mission to perform an in-depth study of neutron stars offers unrivaled astrophysics knowledge and can revolutionize the understanding of ultra-dense matter.

ISS015-E-12880 (10 June 2007) --- A nadir view of the Space Shuttle Atlantis was photographed by a member of the Expedition 15 crew aboard the International Space Station as the two spacecraft were nearing their much-anticipated link-up in Earth orbit. The 17.8 ton S3/S4 truss to be added next week to the station can be seen berthed in the payload bay of the shuttle.

KENNEDY SPACE CENTER, FLA. - In the Space Station Processing Facility, the S3/S4 integrated truss structure (background, right) rests on a work stand. It was moved from a rotation stand at left. Along with a third set of solar arrays and batteries, the truss is scheduled to fly on mission STS-117 aboard Space Shuttle Atlantis to the International Space Station. The crew of six astronauts will install the truss to continue assembly of the station. Photo credit: NASA/Dimitri Gerondidakis

KENNEDY SPACE CENTER, FLA. - Surrounded by workers in the Space Station Processing Facility, Chuck Hardison (left), Boeing senior truss manager, presents the “key” for the starboard truss segment S3/S4 to Scott Gahring (center), ISS Vehicle Office manager (acting), Johnson Space Center. The trusses are scheduled to be delivered to the International Space Station on mission STS-117. Holding the tip of the key at right is astronaut Patrick Forrester, who is a mission specialist on the flight.

ISS015-E-12926 (11 June 2007) --- Astronauts Jim Reilly (right) and John "Danny" Olivas, both STS-117 mission specialists, participate in the mission's first planned session of extravehicular activity (EVA), as construction continues on the International Space Station. Among other tasks, Reilly and Olivas connected power, data and cooling cables between S1 and S3; released the launch restraints from and deployed the four solar array blanket boxes on S4 and released the cinches and winches holding the photovoltaic radiator on S4.

S117-E-06896 (11 June 2007) --- Astronauts Jim Reilly (bottom) and John "Danny" Olivas (top right), both STS-117 mission specialists, participate in the mission's first planned session of extravehicular activity (EVA), as construction resumes on the International Space Station. Among other tasks, Reilly and Olivas connected power, data and cooling cables between S1 and S3; released the launch restraints from and deployed the four solar array blanket boxes on S4 and released the cinches and winches holding the photovoltaic radiator on S4.