What's an LST?

Landing Ship Tank (LST) was the military designation for naval vessels created during World War II to support amphibious operations by carrying significant quantities of vehicles, cargo, and landing troops directly onto an unimproved shore.  For further reading, Wikipedia has an article about the LST designation and the construction of the ships during WWII.

USS LST 268 Specifications: (from the Office of Naval Intelligence - 1945)

Displacement 1,625 t.(lt), 4,080 t.(fl) (sea-going draft w/1675 ton load)
Length 328' o.a.
Beam 50'
     (light) - 2' 4" fwd, 7' 6" aft
     (sea-going) 8' 3" fwd, 14' 1" aft
     (landing) 3' 11" fwd, 9' 10" aft (landing w/500 ton load)
Speed 12 kts. (maximum)
Endurance 24,000 miles @ 9kts. while displacing 3960 tons
Complement 7 officers, 104 enlisted
Troop Accommodations 16 officers, 147 enlisted
Boats 2 LCVP
Cargo Capacity (varied with mission - payloads between 1600 and 1900 tons)
Typical loads:  One Landing Craft Tank (LCT), tanks, wheeled and tracked vehicles, artillery, construction equipment and military supplies. A ramp or elevator forward allowed vehicles access to tank deck from main deck.  Additional capacity included sectional pontoons carried on each side of vessel amidships, to either build Rhino Barges or use as causeways. Married to the bow ramp, the causeways would enabled payloads to be delivered ashore from deeper water or where a beachhead would not allow the vessel to be grounded forward after ballasting
Armament (varied with availability when each vessel was outfitted.) Retro-fitting was accomplished throughout WWII.
The ultimate armament design for United States vessels was:
     2 - Twin 40MM gun mounts w/Mk. 51 directors
     4 - Single 40MM gun mounts
     12 single 20MM gun mounts
Propulsion two General Motors 12-567, 900hp diesel engines, two shafts, twin rudders