U.S. Air Force Senior Airman Marco Melendez, left, and U.S. Air Force Staff Sgt. Mary Lynn Llaguno roll a simulated patient to her back during a mass casualty exercise on Al Udeid Air Base, Qatar, Dec. 15, 2015. Melendez and Llaguno are assigned to the 379th Expeditionary Medical Operations Squadron. U.S. Air Force photo by Master Sgt. Joshua Strang