I am currently thinking of adding an OSS Field Team to the American army list.
The idea would be to have a series of troops that are slightly more technically advanced than the standard US forces and that can be used as infiltrators. They would have better weapons and armour but be limited to a single unit. This also makes the OSS Agent for stage 2 make more sense.
I am thinking of using the West Wind Productions armoured US Infantry miniatures for the troops.