An Allied convoy heads eastward across the Atlantic, bound for Casablanca, in November 1942. U.S. Navy (photo 80-G-474788), Post-Work: User:W.wolny – This media is available in the holdings of the National Archives and Records Administration, cataloged under the National Archives Identifier (NAID) 520948.
War on the Rocks has a post entitled, “Convoy Escort: The Navy’s Forgotten (Purpose) Mission”
Since it has been a Coast Guard mission and may be again, it might be of interest.
Contrary to the impression you may get, most of the North Atlantic convoy work during WWII was done by Great Britain’s Royal Navy and the Royal Canadian Navy. The US Navy played a relatively minor role until mid 1943.
USCGC Duane on North Atlantic Convoy Duty
Chuck Hill's CG Blog 