KENNEDY SPACE CENTER, FLA. - Mission STS-121 Pilot Mark Kelly (left) and Mission Specialist Piers Sellers (kneeling) get a close look at the Integrated Cargo Carrier at the SPACEHAB facility in Cape Canaveral during a Crew Equipment Interface Test. 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. - 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. - Mission Specialist Piers Sellers (left) and Commander Steven Lindsey work with the pump module at the SPACEHAB facility in Cape Canaveral during a Crew Equipment Interface Test. 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. - STS-121 Commander Steven Lindsey (left) and Mission Specialist Piers Sellers (right) are removing a cover on the trailing umbilical assembly at the SPACEHAB facility in Cape Canaveral during a Crew Equipment Interface Test. 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. - Mission Specialist Michael Fossum looks at the pump module at the SPACEHAB facility in Cape Canaveral during a Crew Equipment Interface Test. 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. - 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. - STS-121 Mission Specialist Piers Sellers (left) and Commander Steven Lindsey (right) are practicing removing the cover and strap on the trailing umbilical assembly at the SPACEHAB facility in Cape Canaveral during a Crew Equipment Interface Test. 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. - While STS-121 Mission Specialist Michael Fossum (center) fixes his glove, Commander Steven Lindsey (left) and Mission Specialist Piers Sellers (right) talk about their next step in the Crew Equipment Interface Test at the SPACEHAB facility in Cape Canaveral. 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. - STS-121 Mission Specialist Piers Sellers (left) and Commander Steven Lindsey (right)are practicing removing the cover on the pump module at the SPACEHAB facility in Cape Canaveral during a Crew Equipment Interface Test. 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. - Mission Specialist Piers Sellers (left) and Commander Steven Lindsey (right) are working with the pump module at the SPACEHAB facility in Cape Canaveral during a Crew Equipment Interface Test. 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. - Mission STS-121 Pilot Mark Kelly, and Mission Specialist Piers Sellers (kneeling) and Commander Steven Lindsey (right) get a close look at the Integrated Cargo Carrier at the SPACEHAB facility in Cape Canaveral during a Crew Equipment Interface Test. 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