Georgia had a naval militia. They even have a nice little plaque on the side of the road down on Saint Simon's Island.
You could get .50 cals post WWII as well. I'm sure someone, especially with the amount of USAAF armores mustered out of the war could have made that work.
NRA Life Member
Ladyfriend: "I need help with the leaves in the yard"
Me: "Controlled burn?"
LadyFriend: "I forgot my Boy Scout turned into an infantry officer."