A U.S. Air Force Airman and Japan Ground Self -Defense Force soldiers inspect a shock tube during a three-day tour at Misawa Air Base, Japan, Feb. 22, 2017. The shock tube is used by explosive ordinance disposal technicians to initiate a percussion actuated neutralizer in order to simulate a small scale explosion. (U.S. Air Force photo by Staff Sgt. Melanie A. Hutto)