Donated blood of U.S. Marines with 1st Battalion, 2nd Regiment is stored in a cooler until U.S. Navy hospitalmen with Combat Logistics Battalion 1, are ready to perform tests on the samples 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)