[bdgfate]

That looks like a Vietnam era army "baseball" hat and fatigues.
Perhaps a VC weapons capture??

I second that. The pic is from Viet Nam.

Regarding the lack of shellac (hey that rhymes!), here's what my reportedly "Viet Nam capture" M44 looks like. The stock is pretty well worn bare in many places.

 

[bdgfate]

This was from a WWII newsreel. Sure it could be posed. No reason to fake the date. There was lots of footage shot during the war and the hard part would be cutting it down to 30 hours. No need to fake any. This was 5 seconds of a 30 hour series.

But that uni didn't exist in 1941-1945, unless he was a time traveler.

Filmmakers grab whatever stock they can find to tell their story and sometimes the image is more important than historical accuracy.