U.S. Air Force Capt. <PERSON>, 20th Medical Operations Squadron clinical nurse, explains how to fill out the Department of Defense C.W. Bill Young Bone Marrow Program packet to <PERSON> <PERSON>, 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 <PERSON>. <PERSON>/Released)