|Built by||Bethlehem-Hingham Shipyard Inc. (Hingham, Massachusetts, U.S.A.)|
|Laid down||5 Nov 1943|
|Launched||28 Dec 1943|
|Commissioned||16 Feb 1944|
|Decommissioned||12 July 1946|
On 29 May 1944, U-549 slipped undetected through the screen of the hunter-killer group TG 21.11, formed around USS Block Island (CVE 21) and at 20.13 hours fired three T-3 torpedoes on the carrier, one or two of them struck and she sank northeast of Canary Islands.
At 20.40 hours, USS Barr (DE 576) was damaged in the stern by a Gnat and a second Gnat missed USS Eugene E. Elmore (DE 686). But U-549 was then attacked and sunk by the latter and USS Ahrens (DE 575).
USS Barr (DE 576), which was on her first war voyage, lost 15 killed and 2 DOW, On the following morning the 13 injured and some personnel were transferred to USS Eugene E. Elmore (DE 686), which took the badly damaged destroyer escort in tow. Assisted by USS Wilhoite (DE 397) and the Dutch tug Antic they arrived in Casablanca on 5 June. After preliminary repairs, USS Barr (DE 576) was towed by USS Cherokee (ATF 66) to Boston, arriving there on 25 July.
The vessel was converted to an auxiliary high speed transport, reclassified APD-39 and re-entered service in November 1944.
Stricken 1 June 1960.