History
United States
Name	John S. Mosby
Namesake	John S. Mosby
Owner	War Shipping Administration (WSA)
Operator	Isthmian Steamship Co.
Ordered	as type (EC2-S-C1) hull, MC hull 1207
Builder	St. Johns River Shipbuilding Company, Jacksonville, Florida[1]
Cost	$1,661,505[2]
Yard number	15
Way number	3
Laid down	22 July 1943
Launched	3 October 1943
Completed	16 October 1943
Identification	Call sign: KTNX [2]
Fate	Laid up in the, National Defense Reserve Fleet, Wilmington, North Carolina, 7 June 1948 Laid up in the, Hudson River Reserve Fleet, Jones Point, New York, 3 October 1957 Sold for scrapping, 23 December 1970, removed from fleet, 1 July 1971
General characteristics [3]
Class and type	Liberty ship type EC2-S-C1, standard
Tonnage	10,865 LT DWT 7,176 GRT
Displacement	3,380 long tons (3,434 t) (light) 14,245 long tons (14,474 t) (max)
Length	441 feet 6 inches (135 m) oa 416 feet (127 m) pp 427 feet (130 m) lwl
Beam	57 feet (17 m)
Draft	27 ft 9.25 in (8.4646 m)
Installed power	2 × Oil fired 450 °F (232 °C) boilers, operating at 220 psi (1,500 kPa) 2,500 hp (1,900 kW)
Propulsion	1 × triple-expansion steam engine,  (manufactured by General Machinery Corp., Hamilton, Ohio) 1 × screw propeller
Speed	11.5 knots (21.3 km/h; 13.2 mph)
Capacity	562,608 cubic feet (15,931 m3) (grain) 499,573 cubic feet (14,146 m3) (bale)
Complement	38–62 USMM 21–40 USNAG
Armament	Varied by ship Bow-mounted 3-inch (76 mm)/50-caliber gun Stern-mounted 4-inch (102 mm)/50-caliber gun 2–8 × single 20-millimeter (0.79 in) Oerlikon anti-aircraft (AA) cannons and/or, 2–8 × 37-millimeter (1.46 in) M1 AA guns

SS John S. Mosby was a Liberty ship built in the United States during World War II. She was named after John S. Mosby, a Confederate army cavalry battalion commander in the American Civil War. After the war, Mosby worked as an attorney, supporting his former enemy's commander, U.S. President Ulysses S. Grant. He also served as the American consul to Hong Kong and in the US Department of Justice.

John S. Mosby was laid down on 22 July 1943, under a Maritime Commission (MARCOM) contract, MC hull 1207, by the St. Johns River Shipbuilding Company, Jacksonville, Florida; she was launched on 3 October 1943.^[1][2]

She was allocated to Isthmian Steamship Co., on 16 October 1943. On 7 June 1948, she was laid up in the National Defense Reserve Fleet, Wilmington, North Carolina. She was laid up in the, Hudson River Reserve Fleet, Jones Point, New York, 3 October 1957. She was sold for scrapping, on 23 December 1970, to Dawood Corp., Ltd. She was removed from the fleet on 1 July 1971. ^[4]