how many types of navy ships are there
The United States Navy is a powerhouse. The fleet consists of roughly 430 ships in active service or reserve. The vessels run the gamut from the massive Nimitz-class aircraft carrier, which stretches more than 1,000 feet, to the Los Angeles-class submarine that slithers 900 feet below the ocean surface. This map from @Naval_Graphics on Twitter shows all the commissioned and noncommissioned ships of every size as of April 2015.