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Astronaut F. Story Musgrave, STS-6 mission specialist, is assisted in a suit donning and doffing exercise in the weightlessness provided by a KC-135 'zero-gravity' aircraft. Dr. Musgrave and the next mission's other mission specialist, astronaut Donald H. Peterson, participated in the donning and doffing as a simulation for their preparations aboard the Challenger when they are called upon to perform an extravehicular activity (EVA) which was postponed from NASA's first operational STS flight earlier this month. The suit is called an Extravehicular Mobility Unit (EMU).