200328-N-LW757-1015 LOS ANGELES (March 28, 2020) Sailors assigned to the hospital ship USNS Mercy (T-AH 19) perform a drill simulating a patient suffering from cardiac arrest in one of the ships intensive care units, March 28, 2020. Mercy 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. Navy photo by Mass Communication Specialist Seaman Luke Cunningham/Released)