U.S. Air Force Alf, 366th Security Forces Squadron military working dog, acts as opposition forces and hunts down “crashed” pilots during a combat search and rescue exercise April 2, 2019 at Saylor Creek Range near Mountain Home Air Force Base, Idaho. This is one aspect of the Gunfighter Flag exercise that tests the abilities of pilots to stay hidden until rescue arrives while military working dog trainers and their dogs hone their tracking ability in an expansive environment. (U.S. Air Force photo by Airman First Class Andrew Kobialka)