First Lt. Evin Greensfelder, 57th Aircraft Maintenance Squadron viper aircraft maintenance unit officer in charge, practices techniques with Master Sgt. Estafanie Wanous, 57th AMXS viper specialist section noncommissioned officer in charge, during a Rape Aggression Defense Systems class Sept. 18, 2012, at Nellis Air Force Base, Nev. Ten Airmen attended the three-day long course to become certified to teach the curriculum, designed to balance the needs of women to acquire self defense education in a short period of time.(U.S. Air Force photo by Staff Sgt. Christopher Hubenthal)
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