simplified to its main component of walking the strong safety up to the line of scrimmage as an eighth man in the box to help contain the run. Defenses today may also run safety blitzes and corner blitzes at crucial moments without committing wholly to the "46" defense. Up front, teams still use the concept of the "T-N-T" alignment, where two defensive ends are covering (lined up directly across from) the guards, and a nose tackle is covering the center. In the case of a zone-blocking scheme, this makes it difficult for the offensive linemen to reach any of the linebackers on the second level. Lining up This is where defensive players would line up against a normal Pro Set offense. Defensive ends: The weak side defensive end lines up one to two yards outside the weak side offensive tackle. During run plays, his objective is to protect against reverses and counters. Otherwise, on pass plays, he goes after the quarterback. The strong side defensive end lines up on the outside shoulder of the strong side guard. His objective is to make sure that the offensive guard in front of him does not push him inside and does not get released to block the linebacker. Defensive tackles: The weak side defensive tackle lines up on the outside shoulder of the guard. His main objective is the same as the strong side defensive end – to avoid being pinched inside or letting the guard release to block the linebacker. The other defensive tackle essentially becomes a nose guard and lines up in front of the center. Linebackers: The jack linebacker lines up on the outside shoulder of the strong tight end and just slightly behind the line of scrimmage. This allows him to contain runs on the outside, to blitz, or to drop into multiple coverages on the pass. The charley linebacker also lines up slightly behind the line of scrimmage, but on the inside (rather than outside) shoulder of the tight end. This allows him to cover the tight end and make it difficult for the tight end to achieve a quick release. The middle linebacker lines up about four to four and a half yards behind the line of scrimmage and directly in front of the strong offensive tackle. Safeties: The strong safety lines up four to four and a half yards off the line of scrimmage and stands