In 1981–1982, the Indianapolis 500 remained sanctioned by USAC. The preeminent national championship was now the one being sanctioned by CART. The Indy 500 field would consist largely of CART teams, as well as numerous independent, "Indy-only" teams. Indianapolis was not included as a points-paying round of the CART national championship. In addition, by that time USAC had designated Indianapolis an "invitational" race, offering entries only to invited teams. That moved in part to prevent the uproar over denied entries which occurred in 1979. One further race in 1981 was run by USAC at Pocono. This race was not supported by many CART teams, and featured a mixed field filled out by converted dirt track cars. USAC soon stopped sanctioning championship races outside the Indianapolis 500.