U.S. Sailors with Combat Logistics Battalion 1, draw blood from U.S. Marines with 1st 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)