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Tech. Sgt. Benjamin Thomas, 28th Security Forces Squadron defender, briefs Tech. Sgt. Roderick Marquez and Airman Jacquob Fitzgerald, 28th Civil Engineer Squadron firefighters, on a simulated accident situation during a major accident response exercise at Ellsworth Air Force Base, S.D., April 22, 2015. While being evaluated, the exercise provided a means for base first responders to apply their training tailored to specific circumstances and conditions. (U.S. Air Force photo by Senior Airman Anania Tekurio/Released)

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Tech. Sgt. Laurence Holter, 28th Comptroller Squadron NCO in charge of finance services, simulates a head injury caused by a vehicle accident during a major accident response exercise at Ellsworth Air Force Base, S.D., April 22, 2015. The MARE was designed to prepare and assess base personnel and responders actions during severe weather conditions. (U.S. Air Force photo by Senior Airman Anania Tekurio/Released)

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Staff Sgt. Clayton Luker, 28th Medical Operations Squadron medical technician, and Airman 1st Class Robert Martin, 28th Civil Engineer Squadron firefighter, strap Staff Sgt. Jason Prescott, 28th Medical Support Squadron NCO in charge of medical logistics warehouse, onto a wheeled stretcher during a major accident response exercise at Ellsworth Air Force Base, S.D., April 22, 2015. The exercise scenario included a two vehicles collision due to severe weather conditions, testing base personnel’s emergency response actions. (U.S. Air Force photo by Senior Airman Anania Tekurio/Released)