Hi Mike, yes it is wartime.
You might be able to research him via the NARA website.
Start Your Military Service Record (DD Form 214) Request
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Hi, you can usually search the serial number on the NARA ADD website, however it is not matching but there are many WW2 enlistment records to John Calhoun just need to search through to match the serial number.
Here is another with search results for John Calhoun
403 Request Blocked
p.s The links do appear to be working just not the correct names
Looks like a replacement tag may even be postwar added purely due to the lack of info missing which would be seen on an original issued set,no middle initial no tetanus date or blood group,any way he was a Draftee into the sixth corps which was under the second army area,(illinois,michigan,wisonsin)HQ chicago illinois,hope this helps...........