Tech. Sgt. Chris Stephens, 627th Logistics Readiness Squadron customer service NCOIC, uses a sledge hammer on a Keiser Force Machine July 26, 2016, during a firefighter combat challenge at Joint Base Lewis-McChord, Wash. The Keiser Force Machine is used by firefighters to simulate a forced entry using a sledge hammer. (U.S. Air Force photo/Senior Airman Jacob Jimenez)
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