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The National Aeronautics and Space Administration (NASA) has accomplished a “return to extravehicular activity (EVA)” on the Space Transportation System 37 (STS-37) mission that flew in April 1991. This first U.S. EVA in almost 6 years included both an unscheduled EVA on mission day 3 and a scheduled EVA on mission day 4. The unscheduled EVA occurred when the high-gain antenna on the Compton Gamma Ray Observatory (GRO) would not deploy when commanded from the ground. Mission specialists Jerry Ross and Jay Apt quickly donned their space suits, went into the Shuttle cargo bay for EVA, and freed the jammed antenna, saving the $617 million scientific spacecraft. During the scheduled EVA, crewmembers Ross and Apt successfully completed the Space Station Freedom (SSF) EVA Development Flight Experiment (EDFE). EDFE evaluated three classes of equipment planned for SSF: Crew and Equipment Translation Aids (CETA), Crew Loads Instrumented Pallet (CLIP), and EVA Translation Evaluation (ETE).