It's amazing to me how one can look at something multiple times before noticing something.  This evening,  while perusing the posts on this thread again, a realization just kinda just jumped out and slapped me.   The old "tarnished silver appearing" fancy AMC device in post 47 is now identified as a collar device.  If you look at the 1922 pics in post 57, you can see the device (not clearly) on the right side (wearer's right) of the collar on the white shirt and also on the other cadet in the khaki shirt.

Thanks 🙏 

An un-attributed Military Police helmet liner, likely late 1950s or 1960s vintage.   No unit identification.

Eodtek is spot-on with his identification.  The 308-11 was designed to booby trap a canteen loaded with C-4.  Information is very hard to find on this program, the  best source being a monograph done by Mike Weber 15 or 20 years ago.   The Swimmer Weapons System 3081 was an advanced booby trap system developed at China Lake.  Part of that was the group of 7 different 308 special devices.  The basic device was the 308-6, an anti-disturbance that could be coupled with other devices such as timers or pressure switches.  The others were intended for use with fuel tanks, flash lights, cameras, M16 or AK47 magazines, canteens, etc.   These were all low production units intended to be left behind by SEALs, MACV/SOG and similar elite troops.  Most were actually deployed in SE Asia with remaining stocks destroyed in 1979, according to Mike.  So yes, few made and almost no survivors today.  Great item.

Wow I can’t thank you enough, this is gonna make the project. Hopefully the others of the company will take the time to read through these when I print them off for the history binder. It also fills in a bunch of details for my timeline.

A couple of additional medical unit flags......and a medical battalion flag blank

Even though I am just a lurker on these posts on these WWI wings I have to come out and say that they are some of the most beautiful items in the US Militaria.  I love looking at the details that went into these early wings.  The fine feather details, the different types of shields, and the stars cut into them are what make these truly works of art IMO.  While I am not a wing collector at all, I have to say that these wings that pop up on these posts from time to time are really extraordinary and a pleasure to the eyes to look at and study the details.     Just wanted to give you all a shout out for posting a little eye candy for this non-wing guy to view on this platform.  Keep up the great work, and keep posting these amazing pieces of military history.  The TR badges (pilot/RO/FJ) wings have NOTHING on these outstanding wings.  

The rough texture on the N383-66584A contract makes it one of my favorite variants.

I am always interested in your great finds Brad you have found more interesting jeeps then me and I have been riding your coat tails buying them up from you

I love the those gas mask carriers. Took me years to find one out in the wild