200327-M-VO343-2036 LOS ANGELES (March 27, 2020) U.S. Marine Corps Pfc. Arnoldo RomeroVelazco, a rifleman with 1st Battalion, 4th Marine Regiment, 1st Marine Division, posts security to secure the Military Sealift Command hospital ship USNS Mercy (T-AH 19) in Los Angeles, California, March 27. The hospital ship USNS Mercy (T-AH 19) deployed in support of the nation’s COVID-19 response efforts, and will serve as a referral hospital for non-COVID-19 patients currently admitted to shore-based hospitals. This allows shore base hospitals to focus their efforts on COVID-19 cases. One of the Department of Defense’s missions is Defense Support of Civil Authorities. DOD is supporting the Federal Emergency Management Agency, the lead federal agency, as well as state, local and public health authorities in helping protect the health and safety of the American people. (U.S. Marine Corps photo by Cpl. Alexa M. Hernandez/Released)