Maj. Rachelle Hartze, 28th Medical Operations Squadron Aerospace Medicine Flight commander, helps Airmen and their families complete registration forms to donate bone marrow during a Department of Defense Bone Marrow Donor Program registration drive in the Exchange lobby at Ellsworth Air Force Base, S.D., Oct. 15, 2012. There are currently more than 30,000 children and adults in the U.S. suffering from diseases who can benefit from a marrow transplant. (U.S. Air Force photo by Airman 1st Class Hrair H. Palyan/Released)