Walter ``Buddy'' McKenzie leads STS-134 Pilot Gregory H. Johnson foreground, Mission Specialist Michael Fincke.

Walter "Buddy" McKenzie leads STS-134 Pilot Gregory H. Johnson, foreground, Mission Specialist Michael Fincke, space shuttle Endeavour Flow Director Dana Hutcherson and others through Orbiter Processing Facility-1 following 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