The fast combat support ship (AOE) is the Navy's largest combat logistics ship. The AOE has the speed and armament to keep up with the carrier battle groups. It rapidly replenishes Navy task forces and can carry more than 177,000 barrels of oil, 2,150 tons of ammunition, 500 tons of dry stores and 250 tons of refrigerated stores. It receives petroleum products, ammunition and stores from shuttle ships and redistributes these items simultaneously to carrier battle group ships. This reduces the vulnerability of serviced ships by reducing alongside time. USS Detroit and her sister ships are the largest ships ever built on the west coast. Only the Iowa class battleships and aircraft carriers have greater displacements than Sacramento.