Giving blood on the flightline
U.S. Air Force Senior Airman William Ballard, 358th Aircraft Maintenance Unit aircraft electrical and enviromental technician, donates blood to the American Red Cross at Davis-Monthan Air Force Base, Ariz., Feb. 14, 2014. During the donation, one pint of blood is collected which could save up to three lives. (U.S. Air Force photo by Airman 1st Class Betty R. Chevalier/Released)