The SS Keystone State (T-ACS-1) is a crane ship operated by the United States Navy's Military Sealift Command, serving as part of the Ready Reserve Force. Named after Pennsylvania, the state's nickname is the Keystone State. The vessel's origins trace back to its construction as a combination breakbulk-container ship originally named SS President Harrison. Laid down on January 23, 1965, by the National Steel and Shipbuilding Company in San Diego, California, the ship was built under a Maritime Administration (MARAD) contract as a C4-S-1qa hull, with hull number 339. She was launched on February 10, 1965, and delivered to MARAD on April 25, 1966, for service with American President Lines (APL). Initially configured as a breakbulk-container ship, she was converted on February 16, 1973, into a container ship (C6-S-1qc). She continued to operate under APL until July 19, 1982, when she was transferred to the MARAD for lay-up in the National Defense Reserve Fleet (NDRF), first at Suisun Bay, California, and later moved to James River, Virginia, in September 1982. Between 1983 and 1984, the vessel underwent a significant transformation at Bay Shipbuilding in Sturgeon Bay, Wisconsin, converting her into a crane ship (C6-S-MA1qd). This conversion included installing heavy-lift cranes capable of supporting military logistics and prepositioning operations. Commissioned as SS Keystone State on May 7, 1984, she was assigned to the Military Sealift Command's Surge Force and is berthed at Alameda, California. As part of Maritime Prepositioning Ship Squadron Three, she is maintained in a five-day readiness status (ROS 5), ready to rapidly support military logistics and maritime operations. The ship's conversion and service highlight its maritime significance as a versatile logistics vessel within the U.S. Navy's strategic fleet.

This description has been generated using GPT-4.1-NANO based on the Vessel's wikidata information and then modified by ShipIndex.org staff.