U.S. Navy Hospitalman 2nd Class Michael Mangat, a lab technician with Combat Logistics Battalion 1, tests blood 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)