Will save you some time:   https://www.usmilitariaforum.com/forums/index.php?/topic/420475-authentic-usmc-ww1-helmet/    

Thank's for your rocket responses.   I'm waiting for pics of the hole.   Dominique

Can you see the hole that the EGA is fixed to?   Does it look drilled or punched through?

I was at Ft Jackson, SC attending a USAREC NCOIC course in 2007 and saw lots of Navy personnel there in Army ACUs.  When asked they said they “volunteered” for a rotation helping the Army in order to get a prime choice next duty slot guaranteed.  By 2007 the Army had rotated almost every Brigade thru Iraq once and had a personnel shortage that some high up Navy official concocted this idea to help. Most were used to guard ECPs and do On-FOB duties for the tour.  They kept the Navy rank which got confusing at the officer level as none of the officers matched Army officer rank names. we actually felt sorry for them.

Skyler,   This is a set of WW1 era sweetheart or overseas cap-sized American made bullion wings.  I see no immediate red flags.   The main "tell" is in the "faceted" bullion.  Prior to the German invasion in WW2, almost all of the world's bullion raw material was manufactured in a few factories in Lyons France.  The machines to make faceted bullion (a trade secret jealously guarded) were destroyed during the invasion.  With the Lyons' near monopoly on manufacturing bullion material  broken, American and other European manufacturers quickly got into the game.  The best way to discern pre-WW2 bullion is to look at it closely under a strong magnifying glass:  Look at pre-WW2 faceted bullion and it often resembles a "round file".  Later faceted bullion looks more like a jumbled up series of wire triangles under magnification.   The findings (pin and catch) are also consistent with WW1 era wings.  The drop-in safety catch is one of the two types most often encountered.  It is possible the pin has been replaced as the hinge is somewhat bent.  It is impossible to say if this repair was done in 1918 or 2018.   The bullion front seems to be toning nicely with the left wing tip the most obvious.  This gradual toning is hard to fake in a convincing way.  Reproductions tend to look more mottled and uneven (if made from recycled bullion) or as @pfrost describes it, "patina in a can" when chemical patinas have been applied.   Your sweetheart wing appears to have been made by the same manufacturer as this series of full-sized wings:         And, here is full sized variant and similar sweetheart sized wing by this maker side-by-side:     It is noteworthy that all WW1 era bullion wings were hand-made.  Consequently, no two can be exactly alike.  However, close inspection of your wing and the sweetheart wing above will show many consistencies.  So much so that I am confident they are from the same (as yet unknown) maker.   Warm regards   Chris

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WOW. I know they existed, but I’m happy to see this. Makes you wonder how many are still around 

Bumping this beautiful piece! Even if nobody knows where it is, people should still take a look

Not a Western of any pattern/model.    Blade is too narrow for a 71,  Western never had a screw-on pommel where the nut appears integral to the pommel.  All their screw-on pommel construction models were pre-WW2, none after.     Most cutlers dropped screw-on pommel construction during the war and never restarted using it after the war was over.  I say most because someone may have kept it up and I'm unaware of them doing so. 

I seem to remember seeing a ocp or multicam acu with a navy rank on it at a trift store a few years ago. I thought it was odd but didn't pay much attention to it.