I've reduced it to three men, born elsewhere than the US, were naturalized here by the war, who are "p. r." and who I cannot find a death date for.
1.
Peter Rodriguez, still pretty much nothing. The records I need are not online.
2. I can find no death for
Peter Rush (probably a shortening of his real name, he was Russian). I made a profile for him on Familysearch. He is not Michigan Peter Rush.
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3.
Pasquale John Reggione dob March 22, 1896, also went by John Reggione. He is not the Pasquale Reggione who lived in NYC and ended up in Sing Sing. He was from Auburn, NY. Well, Italy originally.
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and finally, I just saw a "missing war veteran" article from 1932, which I haven't followed up on, from the vets agency saying a
Peter H. Roy was missing. I know nothing more about him. Going to take a break from this for a while, if you feel like researching further, go for it.