Characteristics for an American attack cargo ship (AKA) in March 1961

Dimensions 563 x 76 x 24 feet. Speed 20 knots. Troop capacity 275. Cargo capacity 1,600 tons. Landing craft 8 LCM-6; 12 LCVP. Cargo booms 4-35, 2-10, 6-5 and 2-60 ton.

Source

Army forces in amphibious operations (the Army Landing Force). Department of the Army Field Manual FM 31-12. March 1961.