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U.S. Army Sgt. Karl Hawthorne, Combined Air Operations Center air defense communications and tactics specialist, uses a foam roller July 28, 2016, at Al Udeid Air Base, Qatar. Hawthorne uses the foam roller to maintain flexibility and increase the blood flow to muscle groups in his legs during his treatment program. (U.S. Air Force photo/Technical Sgt. Carlos J. Treviño/Released)
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