NASA Administrator Charles Bolden looks at the Space Shuttle Endeavour (STS-134) from the air traffic control tower at the Shuttle Landing Facility (SLF) shortly after Endeavour made its final landing at the Kennedy Space Center, Wednesday, June 1, 2011, in Cape Canaveral, Fla. Endeavour, after completing a 16-day mission to outfit the International Space Station, spent 299 days in space and traveled more than 122.8 million miles during its 25 flights. It launched on its first mission on May 7, 1992. Photo Credit: (NASA/Bill Ingalls)