The term "NAR" doesn't refer to a Navy ship - it's the standard Navy acronym for Naval Air Reserve.
Landing Helicopter Assault
Could mean, United States Ship (USS). Example of use; USS Saratoga (a US Navy Ship).
A large US Navy ship.
The USS Constitution is the oldest comissioned ship in the US Navy. The USS Constitution is "Old Ironsides" and is the oldest ship still commissioned by the U.S. Navy.
In the US Navy, USS stands for United States Ship. It is a prefix used to designate a ship as belonging to the United States Navy. For example, USS Arizona or USS Enterprise.
An SH is a Ship's Serviceman (Barbers, Shopkeepers, etc.). An SHCS is a Senior Chief (E-8) Ship's Serviceman (read Ship's Serviceman Chief Senior).
USS Cole
PCU stands for Pre-Commissioning Unit in the context of a US Navy ship. It is used to designate a ship that is currently under construction and has not been formally commissioned into active service yet. The PCU prefix is typically dropped once the ship is commissioned and officially enters service.
Landing ship tank-type of vessel
It is an approximately six month long deployment by a navy ship in the WESTern PACific.
Designation of a ship of the British Navy- His (or later, Her) Majesty's Ship.