Astronaut Joe H. Engle, STS-2 commander, practices donning and doffing his extravehicular mobility unit (EMU) in the weightless environment afforded aboard a KC-135 "zero-gravity" aircraft.

ASTRONAUT TRAINING ASTRONAUTS EXTRAVEHICULAR MOBILITY UNITS KC-135 STS-2 PARABOLIC FLIGHT WEIGHTLESSNESS

Astronaut Joe H. Engle, commander of STS-2, in suit donning/doffing exercise