The Andromeda-class attack cargo ships were a class of amphibious cargo ship built by Federal Shipbuilding & Drydock Co. in Kearny, New Jersey, and Moore Dry Dock Co., in Oakland, California, during World War II.

Like all attack cargo ships, they were designed to carry combat loaded military cargo and landing craft, and to use the latter to land weapons, supplies, and troops on enemy shores during amphibious operations.

During 1944–1945, the 5"/38 was recognized as the best gun for the dual role of antiaircraft and naval gunfire support, and the 40 mm was seen as the best antiaircraft gun.

The older 20 mm and .50 caliber guns had been recognized to be of limited value, and were being phased out, though they appeared on some of these ships.

The 20 mm guns were later removed from all of them, but it is not clear just when this happened.