week five. The Minnesota Vikings added an alternate purple jersey with no sleeve striping, worn for warm-weather games. The Oakland Raiders used silver numbers instead of black on their white jerseys for the first time since 1963 The Pittsburgh Steelers wore white pants with their white jerseys, the first time they wore white pants since wearing them for all games in 1965. The Philadelphia Eagles wore white helmets at all their games, discontinuing their practice of using green helmets with their white jerseys and white helmets with their green jerseys The Washington Redskins switched from burgundy to gold helmets, and from the arrow helmet logo to a new logo featuring an "R" inside a circle with Native American feathers hanging down from the side Television changes To televise their games, the combined league retained the services of CBS and NBC, who were previously the primary broadcasters of the NFL and the AFL, respectively. It was then decided that CBS would televise all NFC teams (including playoff games) while NBC all AFC teams. For interconference games, CBS would broadcast them if the visiting team was from the NFC and NBC would carry them when the visitors were from the AFC. At the time, all NFL games were blacked out in the home team's market, so this arrangement meant that fans in each team's home market would see all of their team's televised Sunday afternoon games on the same network (CBS for NFC teams and NBC for AFC teams). The two networks also divided up the Super Bowl on a yearly rotation, with the network of the designated visiting conference (NBC for odd-numbered games, CBS for even-numbered game) televising each game through Super Bowl XVIII. From 1970–73, whichever network did not televise the Super Bowl televised the Pro Bowl the next week. Meanwhile, with the debut of Monday Night Football on ABC on September 21, 1970, the league became the first professional sports league in the United States to have a regular series of nationally televised games in prime-time, and the only league ever to have its games televised on all of the then-three major broadcast networks at the same time. Both teams that advanced to the Super Bowl, the Baltimore Colts and the Dallas Cowboys, had suffered humiliating defeats at home on Monday Night Football during the season. All three networks initially signed four-year television contracts through the 1973 season. The