The coverage carried the CBS Radio Sports tag (both with and without ""Westwood One"") for many years before switching to Westwood One. The Mutual Broadcasting System, purchased by Westwood One in 1985, also aired NFL coverage for many years, while NBC Radio, purchased by Westwood One in 1987, had exclusive NFL coverage in 1985-86. Westwood One now acknowledges the NBC Radio broadcasts as part of the entire history of the network's football coverage. Westwood One also served as the distributor for the Sports USA network's NFL games; as such, Westwood One employed Sports USA announcers for certain games covered by the former network, including Thanksgiving Day games, the opening Monday night doubleheader, and Wild Card Weekend, during the 2009 and 2010 seasons. This agreement was terminated in the 2011 offseason.