Doctors collect bone marrow from U.S. Air Force Tech. Sgt. Bruce Davis, 527th Space Aggressor Squadron radio frequency transmission supervisor, at Banner-University Medical Center in Tucson, Ariz., July 2015. Davis' marrow donation was facilitated by the C.W. Bill Young Department of Defense Marrow Donor Program, which works exclusively with military personnel and DoD civilian employees. (U.S. Air Force photo by Airman 1st Class Chris Drzazgowski/Released)
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