crewed transports and cargo ships continued in the operating model for MSTS and its "in service" non-commissioned ships designated as U.S. Naval Ship (prefix "USNS"). Some Army vessels, still crewed by Army civilians just transferred, were suddenly sailing before fully taking on the new service's administrative functions and colors. Currently active ship classes Runnymede-class large landing craft (35 built) MGen. Nathanael Greene-class large coastal tugs (6 built) General Frank S. Besson-class logistics support vessels (8 built) LCM-8 Landing Craft Mechanized - (40 built) The Army has a fleet of approximately 500 watercraft, operated by units of the U.S. Army Transportation Corps. (The Army's watercraft program is managed by the United States Army Tank-automotive and Armaments Command.) These craft are identified by the following hull code and type; DUKW – Six-wheel-drive amphibious truck JMLS – Joint Modular Lighter System LACV-30 – Lighter ACV 30-ton LAMP-H – Lighter, Amphibian - Heavy Lift LARC – Lighter, Amphibious, Resupply, Cargo (in 5, 15 and 60-ton versions) TLV – Theater Logistics Vessel RIB – Rapidly Installed Breakwater System BC – Barge, dry-cargo, nonpropelled BCDK – Conversion kit, barge deck enclosure BCL – Barge, dry-cargo, nonpropelled, large BD – Crane, floating BDL – Lighter, beach discharge BG – Barge, liquid cargo, nonpropelled BK – Barge, dry cargo, nonpropelled BPL – Barge, pier, nonpropelled BR – Barge, refrigerated, nonpropelled CF – Ferry, Causeway FB – Ferryboat FD – Dry dock, floating FMS – Repair shop, floating, nonpropelled FS – Freight and supply vessel, large J – Boat, utility LARC – Lighter, amphibious LCM – Landing craft, mechanized LCU – Landing craft, utility LSV – Logistics support vessel LT – Tug, large, seagoing MWT – Modular Warping, Tug ST – Tug, small, harbor T – Boat, passenger and cargo TCDF – Temporary crane discharge facility Y – Vessel, liquid cargo The US Army Corps of Engineers has a total of 11 dredge vessels, divided into hopper and non-hopper dredges. In total the Corps has approximately 2,300 floating plant assets, including barges, tow boats, floating cranes, survey boats, patrol boats and dredges. Aircraft Repair Ship Aircraft Repair Units (Floating) A classified program named Operation Ivory Soap was conceived by the Air Technical Service Command to service aircraft close to the front in the Pacific Theatre of Operations. Six Liberty ships were converted at Point Clear, Alabama, near Brookley Field, outside Mobile, Alabama. Conversion began in the spring of 1944.