U.S. Navy Hospitalman 2nd Class Kowalsky Lucien with Combat Logistics Battalion 1, informs Marines with 1st Marine Battalion, 2nd Marine Regiment on the correct way to fill out required paperwork 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)