World War One Division Patches

This is a topic which likely interests only me, but these photos depict World War One U.S. service coats, for the most part.  The photo immediately above also depicts some leather jerkins, a type of long vest that's almost Medieval in appearance, but which made a reappearnce in the Allies forces during World War One, due to their utility.

Anyhow, these photos show a lot of divisional patches from the Great War.

The U.S. Army hadn't assembled on this level since the Civil War, which was also the last time the Army had been large enough to use large unit symbols and badges.  That had fallen completely by the wayside after the Civil War, but during World War One, it came back in.  In the Army, it's remained the norm ever since.  In the Marine Corps, which was in the 2nd Division during World War One, it disappeared, reappeared during World War Two, and disappeared again thereafter.

I frankly don't recognize all of these patches, although I do a fair number.  Fans of U.S. uniforms, or those who have been in the service, will also recognize quite a few, sometimes in a bit of a surprising way. The "AA", ie., All American, division patch of the can be seen above, but before that unit was airborne and therefore before it had an airborne tab.  Quite a few other patches are recognizable, others not.

I"m unfortunately not familiar enough with the other patches to recall what they symbolize.  Some are obvious, like the small machinegun patch on the 82nd uniform above.  Others I generally don't recognize. Some may be wound badges, and some represent months overseas.  Why the private stripes on so many of these service coats are red, I don't recall, as generally at least World War One enlisted stripes were the same olive color as the coat, so that they were not easy to spot by enemy troops.