Nice haul. 

What a really neat family grouping.  Absolutely wonderful items that the family kindly donated.  Thank you for posting Mark.

This is my best guess as to which William F Meyer it is.                       Death Certificate - William F Meyer.pdf WWI US Transport - William F Meyer.pdf

Great looking helmet! Yes I don’t see any red flags either, very nice WWII era set.    It looks like the liner has two painted over horizontal bars on the side. The 28th used those for a short time as tactical marks to notate each battalion I believe within the 109th infantry regiment. I have a similar helmet that is identified to an officer in the third battalion so it has three horizontal bars on the sides.    I’ve only seen a couple other 28th ID helmets with the bars and all have either been painted over or scratched off.    Here’s my set    

Good evening everyone!   Recently I was able to make my way to one of my favorite surplus store I've ever encountered. Over the years I became great friends with the owner and spent tens of hours and thousands at his place. This is the last haul before I ship out to basic (a week away!) and possibly the last forever. He's been in the surplus game decades longer than I have been alive, and retiring this year. All his stuff is 50% off all marked items but unfortunately (and fortunately) since I have the privilege of going into his back warehouse, none of the stuff was marked so it was best offer. This store has supplied me with hundreds of items for display at museum events and displays for the public. He will be missed!    A few of the highlights: 1953 Mitchell Shelter Half. Named LTC (Arle E. Queen O-270381, no time to research sadly) Westinghouse with double wire sweatband and green liner chinstrap (though broken). 1944 OD7 Boyt Cartridge Belt Mint NOS "ATLAS 1944" Khaki Canvas M1 Garand Sling (Piece of paper is just instructions for setting up the M-1956 gear. Cool piece of ephemera! All the canteen covers are M-1956 apart from the khaki one.)

Incredible research and thanks for this post! I'll definitely follow this. Curious, in post 21, are those animal cleaning racks in the lower right?

I did “some” search on US Army transportation manifests during WWI and found “like” two (2) individuals 166th infantry (but the last name had an “S” added to the end “MEYERS” so could be typo or wrong man and 38th Division, 139th field artillery, Supply co. “Wagoner”…might be your man serial Number 1575749

Dates in Fort Mojaves history. https://www.bing.com/ck/a?!&&p=79d1b56e661d4ffa469ab1a5f650b6a50d33d6f619a406f3c8edac945ccd98acJmltdHM9MTc4MDAxMjgwMA&ptn=3&ver=2&hsh=4&fclid=090314c8-1a7e-6b3a-0591-02761bec6a11&psq=fort+mojave+military+campaigns&u=a1aHR0cHM6Ly9tb2phdmVkZXNlcnQubmV0L21pbGl0YXJ5L2V4cGVkaXRpb25zLw

This undated photograph shows Steamer Mohave and Barge No. 3 at Fort Mohave. The host of the site dates the photo between 1870-79.

A different variation