The U.S. Navy has many different types of ships that each have certain roles. Some ships are: hospital ships, aircraft carriers, supply ships, destroyers, frigates, submarines, amphibious ships and hovercraft. There are many other types also.
two
245 active ships
20 Ships
459
The Air Force has Aircraft not Ships. The Navy has Ships.
2
No, there are many hospitals in the US that do not have research.
Hospital ships and standard transports (Victory and Liberty ships).
54
9
field hospitals and navy hospital ships