The command was home ported in Bermuda during the latter part of 1942 and consisted mostly of older R- and S- boats.

In April 1943, the Operational Training Command, Atlantic Fleet was established with Rear Admiral D. B. Berry in charge.

Late in 1943 two Free French submarines were made available for the Training Command under United States supervision.

After the invasion of Sicily and the landing at Anzio in January 1944, five Italian submarines came across the Atlantic in February 1944 and were assigned to ASW Training Command.

With the curtailment of the escort program, the activity at Bermuda was no longer needed and was transferred to Guantanamo Bay, Cuba.