U.S. Air Force Staff Sgt. Brandon Berry, an electrical power production specialist assigned to the 509th Civil Engineer Squadron, is trained by Senior Airman Tiffani-Amber Petit, a physical therapy technician assigned to the 509th Medical Operations Squadron, on how to use crutches when traveling down a stair case to avoid further injury at Whiteman Air Force Base, Mo., Nov. 15, 2017.
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