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.
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"Boy Scout Problem #18: Living with the fear that one day someone will find out you can't tie anything more complicated than a square knot."