U.S. Air Force Senior Airman Ephraim Colburn, 439th Supply Chain Operations Squadron combat support and sustainment technician, leans on Senior Master Sgt. Ryan Alston, 439th SCOS superintendent, during a stretching exercise prior to the start of the Squadron Fitness Challenge at the Langley Air Force Base, Va., track, May 24, 2012. During the challenge, teams from around the based competed for time in several fitness-based events. (U.S. Air Force photo by Senior Airman Wesley Farnsworth/Released)