The current drill sergeant hat evolved from the 1883 campaign hat. That headgear was a modified (flat brim versus upturned brim) Montana Peak, which was adopted for wear by the army in 1911, and ...

Fort Gordon Advanced Individual Training drill sergeants hanged up their hats during a de-hatting ceremony and traded them for a pistol belt and AIT Platoon Badge identifier, Oct. 18, 2007.