Staff Sgt. David Watters (center), 412th Operations Support Squadron Survival, Evasion, Resistance and Escape specialist and Initial Survival Training instructor, goes over navigation techniques May 16, 2012, with aircrew participants attending the three-and-a-half-day IST course hosted by Edwards Air Force Base SERE specialists. The course is intended to teach aircrew members the basic principles of survival in a remote wilderness location. (U.S. Air Force photo/Jet Fabara)