181206-N-MD713-0057 SAN DIEGO (Dec. 06, 2018) Medical professionals from Naval Medical Center San Diego (NMCSD), currently assigned to the hospital ship USNS Mercy (T-AH 19), work on a mock patient during a mass casualty drill for Mercy Exercise (MERCEX). Mercy holds MERCEX quarterly to prepare their crew for upcoming missions. Mercy mans, equips, and deploys a 1,000 bed level III contingency medical treatment facility activating within 5 days to execute wartime, humanitarian, and disaster relief missions. (U.S. Navy photo by Mass Communication Specialist 3rd Class Cameron Pinske/Released)