U.S. Air Force Chief Master Sgt. Richard Parsons, command chief of Air Combat Command, finishes the firefighters’ challenge at the 633rd Civil Engineer Squadron fire station on Langley Air Force Base, Va., July 17, 2013. Firefighters at the 633rd CES must finish the physical assessment in less than eight minutes in order to pass. (U.S. Air Force photo by Airman 1st Class Victoria H. Taylor/Released)