JSC2011-E-040371 (8 April 2011) --- NASA astronauts, from left, Rex Walheim, Chris Ferguson and Doug Hurley inspect the middeck of the space shuttle Atlantis during the STS-135 Crew Equipment Interface Test (CEIT) in the Orbiter Processing Facility at the Kennedy Space Center in Florida, April 8, 2011. Photo credit: NASA Photo/Houston Chronicle, Smiley N. Pool