U.S. Army Spc. Kathy Hysong applies a bag valve mask to assist a simulated casualty with breathing during an exercise at the Troop Medical Clinic, Contingency Operating Base Warhorse, Iraq, June 6, 2011. Hysong is a medic with the 15th Brigade Support Battalion, 2nd Advise and Assist Brigade, 1st Cavalry Division, United States Division-North.