U.S. Air Force Senior Airman Jordan Hansen-Lewis, 4th Aircraft Maintenance Squadron avionics systems apprentice, swims during a portion of a Physical Ability and Stamina Test in Goldsboro, N.C., Aug. 12, 2013. The airmen had to complete two 25-meter underwater swims and a 500-meter surface swim using only a freestyle, breaststroke or sidestroke. (U.S. Air Force photo by Airman 1st Class Brittain Crolley/Released)