I grew up watching professional football back in the 70s, when defenses were so good they had their own nicknames. The Pittsburgh Steelers had the “Steel Curtain,” the Miami Dolphins had the “No-Name Defense” and the Dallas Cowboys had the “Doomsday Defense.” The Cowboys’ defense was based on a newfangled concept called the flex defense, which their coach, Tom Landry, introduced in 1964 and the team perfected over the next decade.

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