Air Force Photos

Gerd Mueller hammers the Keiser force machine during the first Mosel Firefighter Combat Challenge July 5, 2014, in Ediger-Eller, Germany. The Keiser force machine simulates hammering a hole into a burning building. Mueller is a 52nd Civil Engineer Squadron firefighter crew chief and a native of Gransdorf, Germany. (U.S. Air Force photo/Staff Sgt. Christopher Ruano)

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Photo by: Christopher M Ruano |  VIRIN: 140706-F-VS255-408.JPG