Terminology
SSBN is the US Navy hull classification symbol for a nuclear-powered, ballistic missile-carrying submarine. The SS denotes a submarine, the B denotes "ballistic missile," and the N denotes "nuclear powered." In US naval slang, ballistic missile submarines are called boomers. They operate on a "Gold" and "Blue" two-crew concept.
In Britain, they are known as SSBNs or Bombers. The two crews are called "port" and "starboard" crew.
The French Navy commissioned her first ballistic missile submarines as SNLE, for Sous-marin Nucléaire Lanceur d'Engin (lit. "nuclear-powered device-launching submarines"). The term applies both to ballistic missile submarines in general (for instance "British SNLE" occurs ) and, more technically, as a specific classification of the Redoutable class. The more recent Triomphant class is referred to as SNLE-NG (Nouvelle Génération, "New Generation"). The two crews used to maximise the availability time of the ships are called 'blue' and 'red' crews.
The Soviets called this type of ship RPKSN which is translated as "Strategic Purpose Missile Cruiser Submarine". This designation was applied to the Typhoon class. Another designation used was PLARB which translates as "Nuclear Submarine with Ballistic Missiles". This designation was applied to smaller submarines such as the Delta Class.
Read more about this topic: Ballistic Missile Submarines