I know we see the occasional request about American servicemen, so this might prove helpful.

I've found that Findmypast have a record set called World War II Army Enlistment Records.

FMP say "This comprehensive military history collection includes more than 8.7 million records of men and women who enlisted to serve in the United States Army during World War II. These transcriptions include enlistments from 1938 to 1946. The original punch cards enlistees completed when they joined the army were destroyed after being microfilmed in 1947."

FMP also have a record set called "US Servicemen In North Devon, England 1943-1945", and say "This lists over 5,000 US servicemen who were stationed in North Devon during the Second World War. The records consist of original visitor books kept by the local servicemen’s club which recorded the servicemens’ names, date of signing, service number, location details, hometowns, and states. Images may also reveal additional notes and the servicemens' signatures.

They also have US National Archives, World War II Army enlistment records - Reserve Corps records index 1938 - 1946.

Pam