Redesignated Miscellaneous Auxiliary AG-521
Assurance was redesignated AG-521 on 1 March 1973. On the 23d, she sailed to Fort George Island, Florida, for overhaul by the Atlantic Drydock Corp. During this work, her minesweeping gear was removed. Assurance was back in Charleston on 1 June to commence a restricted availability. She got underway on 8 October, bound for Norfolk, Virginia, and refresher training. From 19 to 27 November, Assurance was off Port Everglades, Florida, for tests. The ship closed the year in port at Charleston.
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