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In page USS Dahlgren (DD-187):
"Dahlgren sailed out of Norfolk and Newport, Rhode Island on patrols and escorted submarines in their training, and from January to 1 April 1941 she served in the Patuxent River, Maryland, in experiments in ordnance and submarine detection. Through the summer of 1941, she tested a variable-pitch propeller, and subsequently escorted a new cruiser during her trials. On 4 January 1942, Dahlgren arrived at Key West to escort the battleship Washington in operations in the Gulf of Mexico. She returned to New York 8 February for a brief period of coastal patrol, and on 24 March sailed to Key West to serve the Fleet Sonar School and carry out patrols. During these operations, she rescued 57 survivors of Pennsylvania Sun on 15 July 1942, and nine survivors of K-74 on 19 July 1943.
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