Hello all. I picked up this helmet locally and im curious about the liner etc. There is a US 58 stamp inside the crown. Its the tortoise style color inside. The helmet cover is undated.  I believe the liner date reads 1968? Any info helps. Thank yall. 

The M8’s belong to my buddy Barely Lumpkin. i took the MkII’s.

@Charlie Flick I check Rankin every once in a while. Gives a nice overview on Naval items. Thanks for responding!   @thorin6 I found a online version of that https://archive.org/details/flaydermansguide0000flay/page/n3/mode/2up but those coming to this post later may no longer have Internet Archive books available depending on current lawsuits.

I took some close ups of the members in the photo and I see all their name tapes say US Navy so you'd be correct.        

The black is the color of the sterling silver when it oxidizes after the engraver cuts through the gold.....Bodes

The oak leaf emblem on the wing is a navy supply corps, i think.   https://navysupplycorpsfoundation.org/the-embroidered-supply-oak-leaf-uniform-insignia/

Picked up some great M8 and Mark II sheaths today in Huntsville. All are in great shape. Now the search for hardware to put em.

Love this piece, great history behind it too!

The terms are(were), used interchangeably