the one exception was the Washington Redskins under head coach Joe Gibbs who won three Super Bowls with three different starting quarterbacks from 1982 to 1991. Many of these NFL dynasties ended with the departure of their starting quarterback. On a team's defense, the middle linebacker is regarded as "quarterback of the defense" and is often the defensive leader, since he must be as smart as he is athletic. The middle linebacker (MLB), sometimes known as the "Mike", is the only inside linebacker in the 4–3 scheme. Backup Compared to other positions in gridiron football, the backup quarterback gets considerably less playing time than the starting quarterback. While players at many other positions may rotate in and out during a game, and even a starter at most other positions rarely plays every snap, a team's starting quarterback often remains in the game for every play, often to give the team consistent leadership. That means that even a team's primary backup may go an entire season without a meaningful offensive snap. While their primary role may be to be available in case of injury to the starter, the backup quarterback may also have additional roles such as a holder on placekicks or as a punter, and will often play a key role in practice, serving as the upcoming opponent's quarterback during the preceding week's practices. A backup quarterback may also be put in during "garbage time" (when the score is so lopsided and the time left in the game is so short that the final outcome cannot realistically be changed), or start a meaningless late-season game (either the team has been eliminated from the postseason, or the playoff seeding cannot be affected), in order to ensure the starting quarterback does not needlessly risk an injury. Backup quarterbacks typically have the career of a journeyman quarterback and have short stints with multiple teams, a notable exception being Frank Reich, who backed up Jim Kelly for nine years at the Buffalo Bills. A quarterback controversy results when a team has two capable quarterbacks competing for the starting position. Dallas Cowboys head coach Tom Landry alternated Roger Staubach and Craig Morton on each play, sending in the quarterbacks with the play call from the sideline; Morton started in Super Bowl V, which his team lost, while Staubach started in Super Bowl VI the following year and won. Although Morton played most of the 1972