M-16 A1 Ft. Benning, GA. 1979.
Not to hi-jack the thread but one of the other posters mentioned the manufacturer and it reminded me when I was a unit armorer. Some of our M2 50 cal's were made by the AC Spark Plug division of General Motors. Our 4.2" mortars (M30 Cannon) were made by Whirlpool. Just a few that I can remember. I just thought it was funny.