191205-N-NH199-1009 SAN DIEGO (Dec. 5, 2018) Sailors assigned to the Military Sealift Command hospital ship USNS Mercy (T-AH 19) participate in a mass casualty drill. Mercy is currently operating pierside in San Diego for Mercy Exercise 20-1 (MERCEX). Mercy is one of two hospital ships owned and operated by Military Sealift Command. Mercy conducts operations in the Pacific area of responsibility under the guidence of U.S. Pacific Command and Commander Pacific Fleet. (U.S. Navy photo by Mass Communication Specialist 3rd Class Harley K. Sarmiento/Released)