There are different types of Air-cushioned landing craft.

We have absolutely no information about this. This vehicles to be existing only in ARMA 2 and ARMA 2 Operation Arrowhead.

http://en.wikipedia.org/wiki/Personal_water_craft

The RIB is also called RHIB (rigid-hulled inflatable boat). It has a stable, unflexibale hull and flexible tubes. This avoids the boat to sink, if a lot water comes into ti due to bad sea conditions.

This carrier-class is known as Tarawa

The name of this class is USS Wasp