170221-N-OH262-631 ATLANTIC OCEAN (Feb. 21, 2017) Sailors assigned to the Military Sealift Command hospital ship USNS Comfort (T-AH 20) conduct an aviation fire drill on the ship's flight deck. Comfort's underway period was part of the 2017 Comfort Exercise (COMFEX). The exercise is a quarterly training battery designed to keep the medical personnel, support staff and civil service mariners who serve on board the the ship proficient in their duties. Comfort provides an afloat, mobile, acute surgical medical facility when called upon to the U.S. military, and hospital services to support U.S. disaster relief and humanitarian operations worldwide. (U.S. Navy photo by Bill Mesta/Released)