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U.S. Air Force Capt. Kimberly Brewer, 20th Medical Operations Squadron clinical nurse, explains how to fill out the Department of Defense C.W. Bill Young Bone Marrow Program packet to Airman 1st Class Jonathan Bass, 20th Fighter Wing public affairs photojournalist at Shaw Air Force Base, S.C., Sept. 19, 2014. Becoming a potential bone marrow donor starts with a simple mouth swab. (U.S. Air Force photo by Staff Sgt. Kenny Holston/Released)