Ready, set, raid
U.S. Air Force Airman 1st Class Michael Kaiser, left, Airman 1st Class Darius Berard, center, and Airman 1st Class Robert Simpson, right, with the 35th Security Forces Squadron, listen to instructions prior to raiding a building during the two-day Winter Warrior Challenge at Misawa Air Base, Japan, Dec. 13, 2017. The mental and physical challenges included a course with various skills tests along the way, including weapons assembly/disassembly, land navigation, improvised explosive device recognition and close quarters combat tactics. (U.S. Air Force photo by Staff Sgt. Melanie Hutto)