Mercury astronauts Scott Carpenter and John Glenn and NASA Administrator Charles Bolden applaud during the 50 Years of Americans in Orbit presentation for Kennedy employees.

At NASA's Kennedy Space Center in Florida, Center Director Bob Cabana, left, Mercury astronauts Scott Carpenter and John Glenn, and NASA Administrator Charles Bolden applaud during the "50 Years of Americans in Orbit" presentation for Kennedy employees. This year marks 50 years since Glenn and Carpenter became the first two Americans to orbit Earth. Photo credit: NASA/Kim Shiflett