On top of its strict rules preventing people infected with the virus from coming on board, the Navy is also refusing to treat a host of other conditions. Guidelines disseminated to hospitals included a list of 49 medical conditions that would exclude a patient from admittance to the ship.
Ambulances cannot take patients directly to the Comfort; they must first deliver patients to a city hospital for a lengthy evaluation — including a test for the virus — and then pick them up again for transport to the ship."
https://www.nytimes.com/2020/04/02/nyregion/ny-coronavirus-usns-comfort.html