Senior Airman Alexander Buchanan, an aviation resource management journeyman assigned to the 37th Bomb Squadron, participates in a kaiser sled obstacle during the Firefighter Challenge at Ellsworth Air Force Base, S.D., Oct. 7, 2016. The Kaiser Sled obstacle uses a sledge hammer to simulate chopping a roof with an axe. (U.S. Air Force photo by Airman 1st Class Donald C. Knechtel)
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