USS Mobjack (AGP-7)
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USS Mobjack (AGP-7) off Houghton, Washington, on her commissioning day, 17 September 1943
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| History | |
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 United States
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| Name: | USS Mobjack (AVP-27) |
| Namesake: | Mobjack Bay, on the western shore of Chesapeake Bay in Virginia |
| Builder: | Lake Washington Shipyard, Houghton, Washington |
| Laid down: | 25 February 1942 |
| Launched: | 2 August 1942 |
| Sponsored by: | Mrs. H. R. Peck |
| Reclassified: | Motor torpedo boat tender (AGP-7) 11 March 1943 |
| Commissioned: | 17 October 1943 |
| Decommissioned: | 21 August 1946 |
| Honors and awards: |
Three battle stars for her World War II service |
| Fate: | Transferred to U.S. Department of Commerce 21 August 1946 |
  United States
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| Name: | USC&GS Pioneer (OSS 31) |
| Namesake: | Pioneer, one who goes before, as into the wilderness, preparing the way for others to follow |
| Acquired: | 21 August 1946 |
| In service: | by April 1947 |
| Out of service: | by May 1966 |
| Fate: | Sold for scrapping 4 May 1966 |
| General characteristics (Seaplane tender) | |
| Class and type: | Barnegat-class seaplane tender, converted during construction into a motor torpedo boat tender |
| Displacement: |
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| Length: | 310 ft 9 in (94.72 m) |
| Beam: | 41 ft 1 in (12.52 m) |
| Draft: | 13 ft 6 in (4.11 m) |
| Installed power: | 6,000 horsepower (4.48 megawatts) |
| Propulsion: | Four diesel engines, two shafts |
| Speed: | 18.2 knots |
| Complement: | 360 |
| Sensors and processing systems: |
Radar; sonar |
| Armament: |
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| General characteristics (Survey ship) | |
| Type: | Ocean survey ship |
| Length: | 311.6 ft (95.0 m) |
| Beam: | 41 ft (12 m) |
| Draft: | 13.8 ft (4.2 m) |
USS Mobjack (AVP-27/AGP-7) was a motor torpedo boat tender in commission in the United States Navy from 1943 to 1946. She saw service in the Pacific theater during the latter portion of World War II.
After the conclusion of her Navy career, the ship served in the United States Coast and Geodetic Survey from 1946 to 1966 as the survey ship USC&GS Pioneer (OSS 31), the third Coast and Geodetic Survey ship of the name. Pioneer operated in the Pacific Ocean during her career, making an important discovery of magnetic striping on the ocean floor that made a major contribution to the development of the theory of plate tectonics, and was the first ship in the history of the United States Coast Survey or U.S. Coast and Geodetic Survey to visit the Indian Ocean.
Mobjack was laid down as a seaplane tender, AVP‑27, by Lake Washington Shipyard, Houghton Washington, on 25 February 1942 and launched on 2 August 1942, sponsored by Mrs. H. R. Peck. She was reclassified as a motor torpedo boat tender and redesignated AGP‑7 on 11 March 1943 and commissioned on 17 October 1943 with Commander D. B. Coleman in command.
Following shakedown off southern California, Mobjack departed San Diego, California, for the Southwest Pacific on 14 December 1943. Steaming via New Caledonia and the New Hebrides, she arrived at Rendova, British Solomon Islands, on 14 January 1944 to begin duty with Motor Torpedo Boat Squadrons, South Pacific (SOPAC). She trained and supplied patrol torpedo boats (PT boats) in the New Georgia area until 6 March 1944, when she steamed to the Treasury Islands and thence to the motor torpedo boat base, Emirau, arriving on 23 March 1944. In mid‑May 1944 she returned to the Treasury Islands, where she overhauled PT boats and repaired and tended the motor gunboats (PGMs) and landing craft infantry gunboats (LCI(G)s) of Task Group 30.3 into July 1944.
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