Hatch
Deck. "Hit the deck" = "Get on the floor" etc.
A Seaman is the correct informal term for a Navy officer. Informal term for a sailor in the US Navy is "bluejacket".
A "standard" hitch in the Navy is 4 years.
I haven't heard that term when relating to the US Navy. But in the Royal Navy SDG is a scubadiver
A "mess deck" or "galley" is a common term used in the navy to refer to a break area where sailors can relax and eat.
Nothing - Department of the Navy is the formal title for the Pentagon division that encompasses the U.S. Navy and the U.S. Marine Corps. Navy Department is an informal term.
Ajar is the term for a door that is slightly open.
The term "NAR" doesn't refer to a Navy ship - it's the standard Navy acronym for Naval Air Reserve.
term
geedunk
Perform To Serve.
There are no walls in the Navy, either on land or at sea - only Bulkheads.