4th Infantry Division honor guard M1 helmet liner Vietnam War Era. It’s made in 1969, on each side with honor guard decals. A metal Specialist 4 (E-4) is in the front, i’ts named from Ron J Miller.

My gut tells me it's fake, and I doubt it's a prototype. If I was really trying to sell a product to the military, I would think my product would be a top-notch device to draw attention and sell it. 

I have two Knife Crafters WW2 Knives. I am wondering about something on the Sheath. There is a tab on the end with a hole in it. What was that for? did it attach to a button on the pant leg ? Or was it used to tie a Lace around the leg like a holster ?

Good ol' Ft. Benning. 11B. Hayden

You'd be correct! Its a nice 1953 example. Hayden

My Dad SMSgt USAF worked at the 5th Epidemiological Flight at Clark AFB in the Philippines from 1963-67.A photo of him in Thailand getting monkeys to bring back to the lab.

They aren’t common, nor particularly rare.  Every qualified man had one.  I suppose many were thrown away over time.  They are fascinating artifacts unique to the submarine force.

Very nice!     where are you going for basic?

I think the pin holes in your canteen are from corrosion or from minor imperfections in the aluminum stock used.  Someone may have put something acidic in the canteen like lemonade at some point.   I have attached a canteen from my collection that shows what happens when corrosion gets out of control.   As for the "7".  Aluminum Company of America "ACA" seems to havedate coded their canteens in 1918 from April ( 4 ) to November ( 11 ).  Some ACA canteens also have a small star.  This is from observations of original canteens and does not appear in an correspondence between ACA and the government that I could find at the National Archives.  The instructions to all canteen manufactures in mid December 1917 only asked for the maker and the year to be stamped into canteen bodies.