I’m not sure about any of this stuff really I got this helmet passed down to me and was hoping someone can help me figure out if its authentic and it’s worth. 

Same same .. awesome !!!

Very cool, I like it 

Rarely seen Wolf- Brown Inc. multi ribbon assembly using brass base bars affixed to a plastic support backing.  Maybe 1960's 1970's era.  The slide on ribbons were slid on in the front of this clutch back assembly.  

I would be interested to see some images. It is probably very similar to aviation, in that as part of exams, you had to make hand drawn renditions of various aircraft sub systems like hydraulic, electrical or fuel systems. When started flying jets in the late 1980’s it was still something you had to be able to do.  Not really done anymore these days. Would be cool to see how submariners did it, always had huge respect for the submarine force. John

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