Mercury astronauts Scott Carpenter stand for applause at the conclusion of the 50 Years of Americans in Orbit presentation for Kennedy employees.

NASA Administrator Charles Bolden, Mercury astronauts Scott Carpenter and John Glenn, and Bob Cabana, director of NASA's Kennedy Space Center in Florida, stand for applause at the conclusion of 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