Tech. Sgt. Jared Hess, 436th Civil Engineer Squadron explosive ordnance disposal technician, gives a safety briefing to the Staff Sgt. Julio Alonso Airman Leadership School Class 18-A prior to a 2.5 mile ruck march Oct. 19, 2017, at Dover Air Force Base, Del. Each ruck sack weighs approximately 35 pounds. (U.S. Air Force photo by Senior Airman Zachary Cacicia)
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