160922-N-OH262-156 NORFOLK, VA. (Sept. 22, 2016) U.S. Navy Sailors attached to Military Sealift Command's hospital ship USNS Comfort (T-AH 20) perform a computerized tomography scan (CAT scan) on a simulated battle casualty aboard the vessel during a mass casualty drill. The drill was part of the ship's Comfort Exercise (COMFEX). (U.S. Navy photograph by Bill Mesta/Released)