Bob, do a "Google" search on the M247, and that should provide the answer. Check each site that comes, (you may find that it is limited though ....) or failing that, what I do is to fake it, and paint it the colour of the vehicle body. It should be the FS colours for either dark green or black. I don't recall seeing pict's of this vehicle in the three tone NATO scheme. I could be wrong here. How about checking "Rob's Motor Pool" run by a US Army Major. (I have forgotten the spelling of his name at the moment - Sorry Rob!) You could ask him for some information.
Rob Savage