I drove a military themed 60-66 Chevy short bed step side in the Marines at MCAS Yuma back in 1967-68. It was battleship gray with stenciled letters on the door. They said something like “Property US Marine Corps, for official use only, and the serial number”. Sorry no pictures.
But I suppose you mean something more like a camouflage paint job. Here’s an earlier thread that might be what you’re looking for:
http://67-72chevytrucks.com/vboard/s...highlight=camo
Or post #71 on this thread:
http://67-72chevytrucks.com/vboard/s...t=pt-57&page=3