U.S. Air Force Senior Airman D’Vonte Washburn, an aircraft maintenance scheduler with the 1st Maintenance Group, swims during the Physical Aptitude Stamina Test (PAST) at Langley Air Force Base, Va., March 3, 2016. The P.A.S.T. evaluates candidates on physical and mental preparedness for additional challenges throughout the career training. The PAST evaluates candidates on their physical and mental preparedness using two 25-meter subsurface swims, a 500-meter surface swim, one-mile and a half run, push-ups, pull-ups and sit-ups. (U.S. Air Force photo by Airman 1st Class Derek Seifert)