like dump said, we are invaded.
We have given humvees wit mounted 50 cals to mexico to help stop its drug lord problems, but it has been seen and reported that thes humvees piloted by corrupt mexican cops routinely cross the border and throw drugs into the desert where american drug dealers pick them up, i believe there have even been shhotouts between the Border Patrol and the humvees, 50 cals vs shotguns...hm, i'll see if i can find the link.

on the origional topic i think its a good idea i would say it could divert to much equipment but if the mi.litary were to establish training facilities in the desert it could give the feel of live action while not under fire.