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In page USS Spica (AK-16):

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SS Shannock, a cargo ship built in 1919, by American International Shipbuilding Corp. at Hog Island, Pennsylvania, was acquired by the Navy from the United States Shipping Board on 16 November 1921, and renamed Spica (AK-16). Over the following 18 years, she remained out of commission, first at New York City, then at Charleston, South Carolina, and finally at Philadelphia, Pennsylvania, from January 1927 until 1 March 1940, when Spica was commissioned at Norfolk, Virginia, Comdr. E. D. Gibb in command.