Conger tested new submarine equipment at New London, Connecticut, until she cleared 21 July 1945 for Pacific service.

Conger operated in the Caribbean Sea, calling at Memphis, Tennessee, and Vicksburg, Mississippi, in May 1947, until 23 August, when she sailed for a complete circuit of the South American continent on special hydrographic work, passing through the Straits of Magellan.

[7] She returned to the Canal Zone 5 October to resume her Caribbean operations, and on 11 January 1948, she made her base at Key West, Florida.

On 3 June 1949 her home port became Norfolk, Virginia, and she operated along the East Coast and in the Caribbean assisting in the training of surface ships, taking part in fleet exercises, and perfecting her own readiness for action.

BRASS II led to the sonar sphere used on the Thresher class and all subsequent US attack submarines.