The US gubm'nt periodically sells rough terrain trucks and tracked vehicles to small town, county and state wildfire fighting departments. I have seen websites showing what look like converted M548s used as water tankers and logistics vehicles. If there is a clear civilian application for military products, some of the rules of ITARS can be explained.
http://www.wildfirefighters.com/skidgen.html
It can't hurt to ask where they get their parts.