I was wondering that also, This squad came from Mexico and met with some people at a place in the US. They were only seen walking to the border. The NG was not posted as a front line WW1 unit like many here fail to remember. I can see it now.. NG kills pig hunters.
The closest one of them got was 10 yards, at night it appears, yet the NG identified automatic weapons and body armor ?
The "possibly heading for Mexico with drug money" is somewhat strange also - Going south you can have anything in your car, why smuggle it INTO Mexico ? UNLESS as you suspect, they first brought the dope up and got paid for it.