 Complete the following phrase:  The Colts have competed as a member club of the NFL since their founding in Baltimore in 1953 after then-owner Carroll Rosenbloom purchased the assets of the NFLs last founding Ohio League member Dayton Triangles-Dallas Texans franchise. They were one of three NFL teams to join those of the American Football League AFL to form the AFC following the 1970 merger. While in Baltimore, the team advanced to the playoffs 10 times and won three NFL Championship games in 