History
United States
Name	Somerset
Namesake	Somerset County, Maine, Somerset County, Maryland, Somerset County, New Jersey, and Somerset County, Pennsylvania
Ordered	as type (C1-M-AV1) hull, MC hull 2166[1]
Builder	Leathem D. Smith Shipbuilding Company, Sturgeon Bay, Wisconsin
Yard number	332[1]
Laid down	9 October 1944
Launched	21 January 1945
Sponsored by	Mrs. Fred Bradley
Acquired	20 September 1945
Commissioned	delivered to the War Shipping Administration (WSA) prior to commissioning
Stricken	5 December 1945
Identification	Hull symbol: AK-212 Code letters: NKOK
Fate	delivered to WSA for use by the US Army, 2 November 1945
United States
Name	Coastal Sentry
Operator	WSA
Acquired	2 November 1945
In service	2 August 1946
Out of service	28 September 1949
Fate	declared surplus, 12 December 1949 and transferred to the Military Sea Transportation Service MSTS
United States
Name	Coastal Sentry
Operator	MSTS
In service	15 November 1951
Out of service	28 September 1956
Fate	acquired by the USAF, 29 March 1957
United States
Name	Coastal Sentry
Operator	USAF
Acquired	29 March 1957
Refit	as a Missile Range Instrumentation Ship
Identification	Hull symbol: AGM-15
Fate	reacquired by the USN, 1 July 1964
United States
Name	Coastal Sentry
Operator	MSTS
Acquired	1 July 1964
Out of service	11 July 1968
Stricken	9 October 1969
Identification	Hull symbol: T-AGM-15 Code letters: CSQ
Fate	returned to MARAD and sold for scrap, 11 July 1968
General characteristics [2]
Class and type	Alamosa-class cargo ship Coastal Sentry-class Missile range instrumentation ship
Type	C1-M-AV1
Tonnage	5,032 long tons deadweight (DWT)[1]
Displacement	2,382 long tons (2,420 t) (standard) 7,450 long tons (7,570 t) (full load)
Length	388 ft 8 in (118.47 m)
Beam	50 ft (15 m)
Draft	21 ft 1 in (6.43 m)
Installed power	1 × Nordberg, TSM 6 diesel engine 1,750 shp (1,300 kW)
Propulsion	1 × propeller
Speed	11.5 kn (21.3 km/h; 13.2 mph)
Capacity	3,945 t (3,883 long tons) DWT 9,830 cu ft (278 m3) (refrigerated) 227,730 cu ft (6,449 m3) (non-refrigerated)
Complement	15 Officers 70 Enlisted
Armament	1 × 3 in (76 mm)/50 caliber dual purpose gun (DP) 6 × 20 mm (0.8 in) Oerlikon anti-aircraft (AA) cannons

USS Somerset (AK-212) was an Alamosa-class cargo ship that was constructed for the US Navy during the closing period of World War II. She was later acquired by the US Army in 1946 and the US Air Force in 1957 before being reacquired by the USN as the USNS Coastal Sentry (T-AGM-15), a missile range instrumentation ship.

The third ship to be so named by the Navy, Somerset was laid down on 9 October 1944, under US Maritime Commission (MARCOM) contract, MC hull 2166, by the Leathem D. Smith Shipbuilding Company, Sturgeon Bay, Wisconsin; launched on 21 January 1945; sponsored by Mrs. Fred Bradley, wife of the Michigan congressman.^[3] Initially earmarked to be crewed by the US Coast Guard, Somerset was completed at her building yard on 19 February 1945. After she successfully completed her MARCOM acceptance trials, a Navy sub-board of inspection and survey recommended preliminary acceptance on 22 February 1945.^[4]

Broken-down for the voyage via inland waterways, the ship arrived at New Orleans, Louisiana, on 2 May 1945, to be transferred to Pendleton Shipyards at New Orleans for reassembly. Accepted by the Navy on 20 September 1945 within a month of the Japanese surrender, Somerset began the conversion process to a cargo ship on 24 September. Ironically, her prospective commanding officer reported on 28 September that progress of the work was proceeding satisfactorily and that crew deficiencies caused by demobilization had been corrected, when, that same day, 28 September, the ship was earmarked for return to the MARCOM. Her assignment to the US Pacific Fleet was cancelled on 29 September. Her estimated commissioning date had been 15 October. Redelivered to the War Shipping Administration (WSA) at 1500 on 2 November 1945, Somerset was stricken from the Navy Register on 5 December 1945 never having been commissioned.^[4]

On the same day the WSA received the cargo vessel, renamed Coastal Sentry, that agency transferred her to the Stockard Steamship Company at New Orleans. Transferred again, to the War Department, on 2 August 1946 at Baltimore, Maryland., the ship entered the Reserve Fleet, berthed at Suisun Bay, California, on 28 September 1949, with the US Army retaining her title. On 12 December 1949, however, Coastal Sentry was declared surplus.^[4]

The ship resumed commercial operation under the house flag of the Matson Navigation Company on 15 November 1951. Returned to the Reserve Fleet, this time at Astoria, Oregon, on 17 February 1954, Coastal Sentry was taken out of reserve status on 10 May 1955 to be operated by the West Coast Trans-Oceanic Steamship Line for the Military Sea Transportation Service (MSTS). Another stint of inactivity followed, 19 October 1955 – 22 May 1956, after which she again served under MSTS, this time with the Coastwise Line.^[4][5]

Placed in reserve at Olympia, Washington, on 28 September 1956, Coastal Sentry was taken out of the Reserve Fleet on 29 March 1957. Retaining her name, she was operated by the US Air Force as a missile range instrumentation ship (AGM). Reacquired by the Navy on 1 July 1964 and reinstated on the Naval Vessel Register, Coastal Sentry was designated as T-AGM 15.^[4]

Along with Rose Knot, Coastal Sentry not only collected and relayed radio telemetry information from on board spacecraft, but operated in the command-control role, having embarked National Aeronautics and Space Administration (NASA) flight controllers. As an example of that work, Coastal Sentry initiated the necessary re-entry command signals on the Gemini VIII mission when the capsule had to make an emergency landing in the Pacific on 17 March 1966.^[4] For the Gemini Program, she served as a primary tracking station, call sign CSQ, in the western Pacific.^[6]

Transferred to the Maritime Administration (the successor of MARCOM) on 11 July 1968, the ship was delivered the same day to the firm of Fuji Marden and Co., Ltd., of Hong Kong, British Crown Colony, at Fremantle, Australia, for scrapping. Coastal Sentry was stricken from the Naval Vessel Register on 9 October 1969.^[4]

Citations

• Photo gallery of USS Coastal Sentry (T-AGM-15) at NavSource Naval History