160922-N-OH262-162 NORFOLK, VA. (Sept. 22, 2016) U.S. Navy medical personnel attached to Military Sealift Command's hospital ship USNS Comfort (T-AH 20) move a simulated battle casualty to a gurney after performing an emergency operation during a mass casualty drill aboard the vessel. The drill was part of the ship's Comfort Exercise (COMFEX). (U.S. Navy photograph by Bill Mesta/Released)