Gunny Highway is the tough Marine gunnery sergeant played by Clint Eastwood in the 1986 film Heartbreak Ridge, a story about an ageing drill instructor whipping a disorganised reconnaissance platoon into shape. Semper Fi, short for Semper Fidelis, is the motto of the United States Marine Corps, while Oorah is its distinctive battle cry. Together they became a shorthand for Marine pride online, and the short shout is now reused in edits, memes and tribute videos long after the film's release.