USS Stalwart (MSO-493)  USS "Stalwart" (AM-493/MSO-493) was an "Aggressive"-class minesweeper acquired by the U.S. Navy for the task of removing mines that had been placed in the water to prevent the safe passage of ships. The second ship to be named "Stalwart" by the Navy, "MSO-493", ex-"AM-493", was laid down on 22 June 1954 by Broward Marine Shipbuilding Co. Inc., Fort Lauderdale, Florida, launched on 3 December 1955; sponsored by Mrs. Dante B. Fascelli; and commissioned on 23 April 1957, Lt. Comdr. E. F. McCarton in command. "Stalwart" was assigned to Mine Force, Atlantic Fleet, and Charleston, South Carolina, was designated her home port. She held her shakedown cruise in the Guantánamo Bay area during June and July. She entered the Charleston Navy Yard for an extensive overhaul period that was completed in February 1958 which made her, at that time, the most modern minesweeper in the U.S. Atlantic Fleet. "Stalwart" was deployed to the U.S. 6th Fleet from July to December to support American military forces during the Lebanon crisis. She was overhauled again from February to May 1959, after which she participated in various fleet exercises. In August, she was awarded the Battle Efficiency "E" for excellence in the performance of her assigned duties. In March and April 1960, "Stalwart" was selected to perform special project work for the evaluation of new mine hunting techniques with the Operational Test and Evaluation Force at Key West, Florida. In May, the minesweeper participated in amphibious exercises in the Caribbean and again from August to November. She was awarded the minesweeping "M" in August for excellence in minesweeping proficiency. In February 1961, "Stalwart" completed an overhaul and, after refresher training, participated in a joint United States-Canadian exercise off South Carolina. In June, she deployed to the Dominican Republic for fleet exercises and then held a midshipman training cruise to the Caribbean. "Stalwart" deployed to the U.S. 6th Fleet from September 1961 to 24 March 1962. She operated out of her home port until 29 May 1963 when her division, Mine Division 44, was deployed to the Caribbean for four and one-half months and returned to Charleston on 18 October. "Stalwart" resumed her normal routine until 28 March 1966 when her division was again deployed to the Caribbean.