When I got to 2-64 Armor in 3rd ID in Sept '84, nearly everything was Green. M151s, M35s, M1s, M113s, M577s. nearly everything. The only stuff that was MERDC was the GOERS, Gamma Goats, and M109s. And, the M60A3s and some M113s in a few other battalions.
And US Dark Green should work. You'll want to lighten it up a bit with weathering - ALL of our vehicles had a very light tan/gray dusty-looking "film" on them that only went away when they were wet...