Airmen from Ellsworth Air Force Base, S.D., call in a HH-60M Black Hawk helicopter during exercise Combat Raider at the Powder River Training Complex, north of Belle Fourche, S.D., March 15, 2017. Survival, Evasion, Resistance and Escape instructors were there, teaching volunteers how to radio-in their position to rescue teams without giving it away to any potential adversary listening. (U.S. Air Force photo by Airman 1st Class Randahl J. Jenson)