Hospital Corpsman 3rd Class Sudan Roache, from Severn, Md., stores N95 masks in casualty receiving aboard the hospital ship USNS Mercy (T-AH 19) April 20. Mercy deployed in support of the nation's COVID-19 response efforts, and serves 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.