LCAC (Landing Craft Air Cushion)

An LCAC is basically a hovercraft; carried in the well deck of an amphibious assault ship, they carry vehicles and troops from the ship to the shore, before returning for another load. These craft have ramps at both ends to facilitate loading and unloading of their cargo.

(click on thumbnail for larger image) 
This shot looks toward the forward end of an LCAC (probably on PENSACOLA); the two nozzles toward the bow are used to help steer the LCAC, and they are fed waste air that is bled from under the LCAC's cushion. An LCAC has four gas turbine engines (essentially jet engines), two of which turn the drive propellors and two which force air under the LCAC to lift it from the ground or water. 
Looking down into the welldeck of an LSD, and the LCAC within. An LCAC can travel over land or water with ease, and at great speed.
Here, the ramps of two LCACs overlap each other; the WHIDBEY ISLAND class of LSD can carry up to four LCACs at one time. The two propellors seen here are variable pitch, and are each driven by a gas turbine engine. The tail end of two LAV 25 armoured personnel carriers can be seen to the bottom right. The control cockpit on the after LCAC can be seen to the left of the photo behind a prop.
This picture looks forward along the starboard side of an LCAC on GUNSTON HALL. The construction of these craft depends heavily on aluminum, as can be seen from the engine housing to the right.
A close-up of the port propellor. 
Taken from the deck of an LCAC looking aft along the well deck on GUNSTON HALL. 

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