The A-10 Thunderbolt II is a United States Air Force ground attack aircraft built around its 30mm GAU-8 Avenger cannon, which entered service in the late 1970s. Because the cannon fires so rapidly, recordings sound like a single prolonged brrrt rather than individual shots. That distinctive audio spread through military footage, flight simulators and games, then into memes and short videos in the 2010s. Online, the sound became shorthand for overwhelming close air support. It remains popular because listeners recognise the aircraft instantly, even without seeing it on screen.