U.S. soldiers assigned to Alpha Company, 3rd Battalion, 7th Infantry Regiment, 4th Advise and Assist Brigade, 3rd Infantry Division provide security while a simulated casualty is loaded onto a medical evacuation helicopter in Al Asad Airbase, Iraq, March 11, 2011. U.S. soldiers assigned to 4-3 AAB with the assistance of U.S. soldiers assigned to Charlie Company, 3rd Battalion, 126th Aviation Regiment, Massachusetts National Guard conducted evacuating a casualty training.