Senior Airman Carter Matthew (right), a survival, evasion, resistance and escape augmentee, tightens the harness on a student during a water survival training course May 2, 2011, at the Charleston Harbor (S.C.). Every pilot, crew chief and Airmen who are on flight status from Joint Base Charleston must take the water survival training course every three years to maintain their flying status. Airman Matthew is from the 628th Communications Squadron. (U.S. Air Force Photo/Airman 1st Class Jared Trimarchi)