I have one of what I think to be a very similar stamping.  I believe your example was purposely clipped to prevent the functional use of what was originally intended.  In use, it was oval in shape and background painted or enameled white.  The back had two screw posts.  I was told it was worn at the Regimental Headquarters level.  The Regiment was later known as the 55th Infantry Regiment.  Time period is approximately 1890's to early 1900's.  I observed a complete and finished example at the Forks of the Delaware (Allentown Gun show) a few years ago. I was told by the owner that he obtained it during a clean out of the Hahn Company of Baltimore Maryland.  I have attempted to post a photo but was unsuccessful, so I am forwarding the photo to another forum member to assist in posting it. Dave

Without a frontal eyelet, the liner pictured is the final iteration of the M1 helmet liner to use that style of suspension.  It would've been made from 1955-1964. 

As pointed out in one of the post patch king/hobby guild came into the picture and started cracking out made for the collector HR patches just as they did with the Hawaiian Cadre patches.  Note the Lehman blossom, stem and border having a thinner profile than the made for the collector example to the right.  This is the same case with the original Hawaiian Cadre patches.  Yes, details count.   Also, shown is a majority of the ODV cloth ranks/chevrons used by the Hawaii Rifles.  At some point in time and after the recruitment rank identication card was made circa. 1942, evidently technical rating were require to identify specialist within the ranks of the HR organization.   I presume that these were ferriers, blacksmith, cooks, etc... 

Sorry about that. My phone is old and takes bad photos, so here you go.   

In my opinion, collectors are going to struggle with post-Desert Storm military knives in general, not just the private purchase knives. The reason being the military got away from type classifying knives and allowed much more discretion to individual units to purchase off the shelf commercial knives for issue. There are a lot of legitimate US military issued knives that are absolutely identical to the commercially marketed versions. Unless you have some kind of provenance (for example a GI can verify his unit issued him that knife) then it becomes very difficult to differentiate from USGI and civilian knives.   Unfortunately, this can affect even some of the actual US contract knives. For example, Ontario Knives supplied thousands of M9 bayonets to the military, but also sold a substantial number on the commercial market that were not just identical to the GI M9's, but were pulled directly from the GI production line. Same thing applies to other OKC USGI knives. The USMC OKC3S bayonet had a lot of identical civilian bayonets sold, though at some point the civilian versions started using an etched instead of stamped marking on the blade. The early civilian stamped blades were again pulled straight off the USMC line.    I am afraid the War on Terror generation of military knife collecting will never be as straight forward as the older WW1, WW2, Korea, or Vietnam knives. 

Another DUI that shares this distinct backing is the 176th FA. I have a prong-plate screw-back. I don't know if the design exists in pin-back. Dave

That’s an incredible direction to take the discussion—I’d love to hear from anyone who witnessed a Saturn V launch up close. I can only imagine the raw power and sound. Even from the public viewing areas, it must’ve been unforgettable. Being any closer? That’s history in the making!

Harrier in the ’80s? That must’ve been awesome—and loud! The way it hovers and roars is something else. Bet the crowd felt it in their chest!

Looks just like the one I was issued in 1993.

I saw that ABC made for TV movie too, with Richard Basehart. It's called "Sole Survivor". Enjoy....   https://www.bing.com/videos/riverview/relatedvideo?&q=richard+basehart+lone+survivor+abc++tv+movie&&mid=0DA8B3A2E0A01373168E0DA8B3A2E0A01373168E&&FORM=VRDGAR