S115-E-06070 (15 Sept. 2006) --- Attired in their extravehicular mobility unit (EMU) spacesuits, astronauts Heidemarie M. Stefanyshyn-Piper (left) and Joseph R. Tanner, both STS-115 mission specialists, prepare for the mission's third session of extravehicular activity (EVA) in the Quest Airlock of the International Space Station while the Space Shuttle Atlantis was docked with the station. Astronaut Brent W. Jett, Jr., commander, assisted Stefanyshyn-Piper and Tanner.