aggressive patrols of the North Atlantic. 1941 to 1945Greer remained in the North Atlantic through 1941, shepherding convoys to and from MOMP, the mid-ocean meeting point at which American ships took over escort duties from the hard-pressed Royal Navy. After overhaul at Boston, she turned south 3 March 1942 to resume patrol duty in the Caribbean. In addition to regular escort duties, Greer performed many other tasks, including rescuing 39 victims of German U-boats. In May she stood guard off Pointe a Pitre, Guadeloupe, trying to keep the Vichy French government from getting to sea. Sailing from Guantanamo Bay 23 January 1943, Greer sailed to Boston then headed for the Atlantic convoy duty. Departing NS Argentia, Newfoundland 1 March 1943, she escorted merchantmen for Northern Ireland. During heavy North Atlantic gales, Convoy SC 121 lost seven ships to three separate U-boat attacks before reaching Londonderry Port on 13 March. Greer then escorted 40 merchantmen on the return voyage without incident, and continued on to Hampton Roads 15 April with tanker Chicopee. After exercises in Casco Bay, Greer departed New York City 11 May with a convoy of 83 ships. Reaching Casablanca, Morocco, 1 June, the destroyer patrolled off the North African port and then recrossed the Atlantic, arriving New York 27 June. After another run to Northern Ireland, Greer returned to New York 11 August. After steaming to Norfolk, she sailed for the British West Indies 26 August to serve briefly as plane guard to . She rendezvoused with a convoy in the Caribbean and headed for North Africa. Diverted to New York, she docked there 14 September. Routine training exercises turned into tragedy 15 October as Greer collided with off the mouth of Indian River, Delaware Capes (35 miles (56 km) south-east of Cape May, New Jersey). Moonstone sank in less than 4 minutes, but Greer rescued all the crew but one. After repairs, the destroyer escorted the Free French cruiser Gloire from New York to Norfolk. Greer sailed 26 December with another Casablanca-bound convoy and after an uneventful crossing returned to Boston 9 February 1944. This was the final transatlantic crossing for the old four-stack destroyer, as she and her sister ships were replaced by newer and faster escorts. Convoys escorted Auxiliary service The veteran destroyer spent the remainder of her long career performing a variety of necessary tasks in American waters. After a tour of submarine training