Bob Cabana and Scott Carpenter share the stage during the 50 Years of Americans in Orbit presentation for employees at NASA's Kennedy Space Center.

Bob Cabana, director of NASA's Kennedy Space Center in Florida, and Mercury astronaut Scott Carpenter share the stage during the "50 Years of Americans in Orbit" presentation for employees at NASA's Kennedy Space Center in Florida. Mercury astronaut John Glenn and NASA Administrator Charles Bolden joined Carpenter and Cabana for the event.

This year marks 50 years since Glenn and Carpenter became the first two Americans to orbit Earth. Photo credit: NASA/Kim Shiflett