The appearance of a ship in a screenshot or video does not mean that it is a player ship in the game.
The various lists of included ships that have been posted over the past months are based mostly on sightings in screenshots and videos, and on rumors or pronouncements by people who wanted to pretend that they knew.
Attempts to tone down the speculation were discouraged.
One player ship that you can use as a “Naval†vessel is the Hamilton class cutter based on a United States Coast Guard ship. She is the largest non-icebreaking ship in the USCG inventory.
Some corrections need to be made in the way the bow thruster control works, but she is driveable if you experiment to learn how she responds to controls.
