U.S. Navy Hospitalman 3rd Class Brianna Duran, a hospital corpsman with Combat Logistics Battalion 1, draws blood from Lance Cpl. Santiago Amarante, a rifleman with 1st Marine Battalion, 2nd Marine Regiment, during a walking blood bank aboard Camp Leatherneck, Helmand province, Afghanistan, on Aug 14, 2014. The walking blood bank identifies and screens qualified donors so they can donate for specific patients without delay. (Official U. S. Marine Corps photo by Sgt. Dustin D. March/Released)