Nickname in the U.S. Marine Corps for a Drill Instructor whose job it is to teach new recruits how to drill properly. He spends most of his time on the grinder rehearsing drill & ceremonies movements.
"Our Heavy Hat spend all day going over 'inspection arms' with our platoon. My arms are completely shot..."
by Pylon0311 October 1, 2012
Get the Heavy Hatmug.