R. Lee Ermey was a former United States Marine drill instructor who became widely known playing Gunnery Sergeant Hartman in Full Metal Jacket in 1987. He later hosted Mail Call on the History Channel from 2002 to 2009, answering viewer letters about weapons, vehicles and military history while demonstrating equipment in the field. Short barked clips from the series circulated online as reaction sounds because his delivery needs no context to land. Editors still reach for his voice when a video needs instant authority, discipline or a comedic dressing-down.