Top center and top left appear here -->> United States Shipping Board (USSB)  

It’s a M82 7.62mm blank for the M60 MG and M14 rifle.  Earliest I have seen is 1962 dated.  

i have made a few cool finds over the past month to include several WWII Airborne Newspapers. The cabinet photo is signed and is the West Point Cadet photo of Odus Horney, who was a significant contributor to the development of the 03 Springfield rifle and retired as a Brig Gen of Ordnance. The Pistol belt is 1944 dated

KMAG is very cool. Would definitely like to pick up at least a patch some day. Thanks!

Here's a nice 1/35, I think 1/35 model of a Sabre of the Alaska Air National Guard in the 50s with the Red Paint for emergency's .

I have one similar, Mine has a KMAG patch on the other side. Nice uniform

Very nice collection

Guys let me check up on these 

However, I believe the one with the eagle with the red, white a blue shield is a  National Organization of Masters, Mates, and Pilots (NOMMP)   https://ianewatts.org/nommp-not-ussb/

I just did some googling and agree it sure seems to be one. I hadn’t considered it being an ambulance. Hopefully none of you had to take a ride in the back of one of these.  mikie