Seems to be a list of people & some addresses, mainly US. I'll make out what I think I can see, but might be mistaken.
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On the front, bottom right: Y L Winters, (Corp?). Butte, Mont. 18 (?) 1945
There is a Butte, Montana. Possibly a corporal?
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Front centre (across the Paris bit): Doualf (?) W. (?), 2nd Lt C.W.S., Marinette(?) Wis
CWS was the US' Chemical Warfare Service. I don't believe they really saw active action deploying weaponry, but were deployed throughout the battlefields nonetheless.
2nd Lt will be 2nd Lieutenant.
Wasn't 100% on the name, but there is a Marinette, Wisconsin.
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Front top-left: Phil Losse (Fosse?). Top right is a date Jan or June 6 1945.
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Back, upper-centre: Philip A. Young, Arm(?), Spickard, Missouri.
As you noted, this place does exist.
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Back top-left (partially missing): can't make out the name, looks like it starts Moul…, is nav(y), I.C. Mo.
Could be J.C., which would be Jefferson City, capital of Missouri (state abbreviation is MO)
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Back, extreme bottom right: Gene Brennan, Great Falls, Montana.
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Back, bottom right: Henry H. Lujam(?), Salt Lake City, Utah.
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Back, bottom centre-right. Quite hard to tell. Possibly: Carl Pyne, Seliens(?) Stan, Mont.
(Probably Montana).
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Back, bottom centre-left: Sal(?) Juipmann(?), Puci(?), Utah.
Couldn't find Puci in Utah on Google maps though. 🤷
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Back, centre (written upside-down): John D (P, B?) Bradley, 123 R. Street, ? (Looks like Blacklady), Utah.
Again, couldn't find such a place name.
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Back, bottom-left (Upside-down text): John(?) Lucky Ser…, S. Sgt, H67(?)
S. Sgt is probably something like Staff Sergeant. H67 may be a grouping reference, but no clue.
H67 did return a hit for the UK's HMS Fearless, but that was sunk in 1941 off Malta, wouldn't have had a staff sergeant, and goes against the US addresses of everything else. So, probably exclude that.
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And I think that's the lot. A lot of ? about, but might help point you in the right direction.