Woodsy, attached is a photo I culled from the 'Net of an Empire Plastic Corp. carded set showing the same type of small vehicles as in the RUSH HOUR blog post by Wotan this month.
Also, if I may point out a nice website run by Kent Owen Sprecher which chronicles more of these small vehicles: Toy Soldier HQ (although there's far and away more than just military toys listed)
Kent's site is set up as a sales site and while he does have a lot for sale, it's greatest attribute is the history of many of the companies shown, the overwhelming quantity of the companies listed, and the multitude of photos. It's a bit difficult finding things at times but the search is half the fun.