YOKOTA AIR BASE, Japan -- Volunteers assist potential bone marrow donors in filling out paper work at Yokota Air Base, Japan during the bone marrow drive Aug. 1, 2013. Registering as a donor is quick and easy, requiring no blood samples. Registrants fill out a consent form then swab the inside of their mouth to provide cells for testing. (U.S. Air Force photo by Staff Sgt. Stacy Moless)