180512-N-UX013-0064 ATLANTIC OCEAN (May 12, 2018) Lt. Yibo Chen, right, trains Hospital Corpsman 3rd Class Dustin Fulton on how to perform an ultrasound on Hospital Corpsman 2nd Class Binod Gurung during a radiology mass casualty drill aboard the U.S. Navy hospital ship USNS Comfort (T-AH 20) in support of Comfort Exercise (COMFEX) 2018. COMFEX is an advanced-phase training exercise designed to prepare and test the capabilities of the ship’s medical professionals, ensuring readiness to rapidly answer any emergent crisis. (U.S. Navy photo by Mass Communication Specialist 3rd Class Jonathan Clay/Released)