lol...You haven't been in that long, new guy. "Gun truck" is a term out of the Vietnam War. A gun truck was usually a deuce and a half with "add-on" perforated steel plates, sand bages and machine gun mounts. I don't know if this reporter is that old, or has watched too many "Platoon" type films.
Vietnam was a long, long, time ago. It's just that to many of us it seems like yesterday.