Paintings Shows Planes And Helicopters During William Tell, 1976. William Tell is the USAF's World Wide Weapons Meet. The United States Air Force holds a biennial fighter gunnery competition called William Tell in every even-numbered year. In the competition, teams representing the various major commands of the USAF compete in live-fire exercises, using towed banner targets for gun engagements, and obsolete fighters converted into unmanned target drones (currently QF-4 Phantoms) for air-to-air missile engagements.