S125-E-009840 (18 May 2009) --- Astronauts John Grunsfeld (left) and Andrew Feustel, both STS-125 mission specialists, attired in their Extravehicular Mobility Unit (EMU) spacesuits; along with astronaut Mike Massimino (center), mission specialist, are pictured in the Earth-orbiting Space Shuttle Atlantis? airlock as they prepare for the mission?s fifth and final session of extravehicular activity (EVA).