From: Dictionary of American Naval Fighting Ships

Block Island Sound is off the south coast of New England.

(ACV-21: dp. 7800; l. 465'8"; b. 111'6"; dr. 26'; s. 18 k.; cpl. 890; a. 2 5"; cl. Bogue)

The first Block Island (ACV-21) was launched 6 June 1942 by Seattle-Tacoma Shipbuilding Corp., Seattle, Wash., under a Maritime Commission contract; sponsored by Mrs. H. B. Hutchinson, wife of Commander Hutchinson; transferred to the Navy 1 May 1942; and commissioned 8 March 1943 Captain L. C. Ramsey in command. Originally classified AVG-21, she became ACV-21, 20 August 1942, and CVE-21, 15 July 1943.

Departing San Diego in May 1943 Block Island steamed to Norfolk, Va., to join the Atlantic Fleet. After two trips from New York to Belfast, Ireland, during the summer of 1943 with cargoes of Army fighters, she operated as part of a hunter-killer team. During her four anti-submarine cruises Block Island's planes sank two submarines: U-220 in 48°53' N., 33°30' W., 28 October 1943 and U-1059 in 13°10' N., 33°44' W., 19 March 1944. She shared credit with Corry (DD-463) and Bronstein (DE-189) for the sinking of U-801 in 16°42' N., 30°20' W., 17 March 1944 and with Buckley (DE-51) for U-66 sunk 6 May 1944 in 17°17' N., 32°29' W. Three of Block Island's escorts, Thomas (DE-102), Bostwick (DE-103), and Bronstein sank U-709 on 1 March 1943 and the same day Bronstein got U-603.

At 2013, 29 May 1944, Block Island was torpedoed by U-549 which had slipped undetected through her screen. The German submarine put one and perhaps two more torpedoes into the stricken carrier before being sunk herself by the avenging Eugene E. Gilmore (DE-686) and Ahrens (DE-575) of the screen in 31°13' N., 23°03' W.

Block Island (CVE-21) received two battle stars for her service.