JSC2011-E-040349 (7 April 2011) --- NASA astronaut Rex Walheim, STS-135 mission specialist, familiarizes himself with a camera he will use in space during the STS-135 Crew Equipment Interface Test (CEIT) in the Orbiter Processing Facility at NASA?s Kennedy Space Center, Florida on April 7, 2011. Photo credit: NASA Photo/Houston Chronicle, Smiley N. Pool