Greg's comments cover the bulk of US National Guard jeeps in two shades of green, black and tan.
The majority of US jeeps were painted up starting in 1975 in one of several MERDC paint schemes using 12 different colors and four-color layouts. Most common was one in "Winter Verdant" which was (IIRC) FS34079 dark green, FS30118 Field Drab, FS37038 black and FS30277 desert sand, sprayed on in proportions of 45/45/5/5. Most units used the FS30277desert sand color for rectangles to put their bumper codes on.
Greg's observation is the "Summer Verdant" scheme in FS34102 Forest Green, Light Green, Black and Sand. Same proportions.
Another common scheme in the Western US (e.g. Arizona, Nevada, California) was Red Desert -- Earth Red, Earth Yellow, Sand and Black in the same proportions.
Later, in the early 1980s the Winter Verdant scheme went to an approximation of the new NATO scheme and dropped the desert sand shade. Proportions varied according to taste but were more like 40/40/20 green to field drab to black.