Lee, you may be right. Since the picture is in black and white, it's difficult to tell - could be a training mission. The carbines are correct for the WWII period (no bayonet lugs) - in the black shoe army, they would have had lugs. That carbine looks brand spanking new; in the postwar period it would probably have seen a lot of wear; the one I was issued certainly had! Corcoran jump boots were darker than the standard brown... These were "barracks polished" so it could well have been a training mission. I see that the soldier on the right carries an M1 Garand bayonet in what appears to be a (modified?) British-issue scabbard for the P14 Enfield - apparently the Brits were helping out with equipment including often providing Sykes-Fairbairn stilettos!
I'm pretty certain the leather in that pic is black.
Yes, I've seen and even owned some brown Corc's.
As for the bayo lug having to be on a carbine post-war- maybe, maybe not. A large machine like the Army is not perfect in every detail.
Note that in most pics, paratroopers are wearing standard issue boots.
I don't know if Corc's were issued in WW II or if troopers had to buy them. I can state positively that they were NOT issued 1968-71, and I DID have to buy them. They were a good boot for jumping, not as good for walking. I would not have worn mine to combat.
They DID look good, and kept pants bloused better.
I think during the late 50's and early 60's a Corcoran-looking boot with a capped toe was issued. (maybe made by Corc)
It seems like my older brother in law was issued capped toes in that period, and he was armor. As I recall, his toe caps did not have the row of holes between the stitches that real Corc's had.