Gregory H. Johnson and Michael Fincke speak to employees at NASA's Kennedy Space Center during a return event.

STS-134 Pilot Gregory H. Johnson, left, and Mission Specialist Michael Fincke speak to employees at NASA's Kennedy Space Center in Florida during a crew return event.

Commander Mark Kelly, Johnson and Mission Specialists Fincke, Greg Chamitoff, Andrew Feustel and European Space Agency astronaut Roberto Vittori lifted off May 16, 2011, aboard space shuttle Endeavour. During the nearly 16-day STS-134 mission, Endeavour delivered to the International Space Station the Alpha Magnetic Spectrometer (AMS) and spare parts, including two S-band communications antennas, a high-pressure gas tank and additional spare parts for Dextre. This was the 36th shuttle mission to the station and Endeavour's 25th and final flight. For more information, visit www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts134/main/index.html. Photo credit: NASA/Kim Shiflett