The second USS Rockport (SP-738) was built during 1917 and 1918 by Adams Shipbuilding Co., East Boothbay, Maine, as the wooden scientific research vessel Ajax for service in Labrador waters and acquired 2 October 1917 for U.S. Navy service from A. Fabbri of New York City, while still under construction. Commissioned 16 February 1918. Ajax was renamed Rockport 20 February 1918.

History
United States
NameUSS Rockport (SP-738)
BuilderAdams Shipbuilding Co., East Boothbay, ME
Launched1917
Acquired2 October 1917
Commissionedas USS Ajax (SP 738), 16 February 1918
Decommissioned18 February 1919
FateSold 16 September 1919
General characteristics
Displacement200 t
Length124 ft 7 in (37.97 m)
Beam25 ft 7 in (7.80 m)
Draft13 ft 6 in (4.11 m)
Speed10 knots (19 km/h)
Complement23
Armamentone 3-pounder

Rockport was reassigned to the 1st Naval District 1 January 1918 and operated on section patrol duty based at Boston into 1919. She decommissioned 18 February 1919 and was sold 16 September 1919 to Thomas S. Longridge of Belmont, Mass.

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