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The 4-3 Under is an alignment from a four-man defensive front that puts the 3-technique away from the strength of the offense.
The 3-3 Stack is a three man front that has three linebackers lined up directly behind those defensive linemen.
The Eagle front is great for occupying offensive linemen, forcing double teams, and chasing down gap schemes in the run game.
The Okie front occupies gaps with three true defensive linemen which allows versatility and for linebackers to plug unimpeded.
The Bear Front is typically used to combat heavy personnel from the offense on short down and distances or at the goal line.