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In page USS John W. Thomason:

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Extensive conversion and installation of new sonar equipment at Long Beach occupied the ship until July 1962. In December she took part in a massive antiaircraft exercise with units of the 1st Fleet off California. She sailed again for the Far East, a part of the ready-hunter-killer group. En route, however, she took part in recovery operations for Project Mercury as part of a task unit built around the aircraft carrier Kearsarge. During the cruise which followed, the ship trained in her antisubmarine warfare (ASW) tactics and became familiar with her new equipment in operations with 7th Fleet and the Japanese Maritime Self-Defense Force. John W. Thomason returned to San Diego on 3 December 1963.[1]