The sound comes from the Fairchild Republic A-10 Thunderbolt II, a United States Air Force attack aircraft introduced in the 1970s and built around its enormous GAU-8 cannon. Pilots and ground crews nicknamed the firing noise Brrt, and recordings from training ranges and combat footage spread widely on YouTube and gaming forums in the 2000s and 2010s. From there it became shorthand in military memes, flight simulator clips and shooter edits, surviving because no other aircraft sound is so instantly recognisable or so closely tied to one weapon.