USNS Observation Island (T-AGM-23)

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Career (US)

Ordered:	June 1, 1951
Laid down:	September 15, 1952
Launched:	August 15, 1953
Commissioned:	December 15, 1958
Decommissioned:	January 1, 1972
In service:	July 1, 1977
Homeport:	None
Fate:	In service with the Military Sealift Command
General characteristics
Displacement:	approx. 17,015 tons (17,288 t)
Length:	564 ft (172 m)
Beam:	76 ft (23 m)
Draught:	28.58333 ft (8.71220 m)
Propulsion:	Two boilers; 1 GE turbine; 19,250 hp (14.36 MW); 1 shaft
Speed:	20 knots (37 km/h)
Capacity:	Officers: 92 Enlisted: 465
Complement:	65 civilians 20 Navy personnel 35 technicians
Sensors and processing systems:	AN/SPQ-11 Cobra Judy

USNS Observation Island (T-AGM-23), also known as ex-MA-28, ex-YAG-57, ex-EAG-154, Empire State Mariner , is one of two Missile Range Instrumentation Ships operated by the Military Sealift Command. One of the radars it carries is the AN/SPQ-11 Cobra Judy phased array radar.

USNS Observation Island operates worldwide, monitoring compliance with strategic arms treaties and supporting U.S. military weapons test programs. Observation Island carries an Air Force shipborne phased-array radar system for collecting data on missile tests. The ship is operated by Military Sealift Command for the Air Force Technical Applications Center at Patrick Air Force Base.[1]

USNS Observation Island was built as a "Mariner" class merchant ship, launched in August, 1953, and was acquired by the Navy in September 1956 for use as a fleet ballistic missile test ship. The vessel was converted at Norfolk Naval Shipyard, and kept in reserve as a Maritime Administration asset from 1972 until 1977. In August 1977, Observation Island was reacquired by the U.S. Navy and transferred to Military Sealift Command, where it was reclassified as T-AGM 23, a missile range instrumentation ship.[2]