Army Sgt. 1st Class Gregg Johnson, 708th Military Detachment first sergeant, uses a leg stretching apparatus at physical therapy to condition his knee at Misawa Air Base, Japan, July 11, 2012. The purpose of physical therapy is to get people back to full strength and give them the ability to complete the mission. (U.S. Air Force photo/Airman 1st Class Zachary Kee/Released)
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