The Dallas Cowboys have historically used a 4‑3 defense, winning all five of their Super Bowls with that scheme. This season, under new defensive coordinator Christian Parker, the team will switch to a 3‑4 base, the first time since 2012 under Rob Ryan.
Parker emphasized a multiple‑front philosophy, citing his experience with 3‑4 systems from Vic Fangio, Vance Joseph, Mike Pettine and Mike Elko. The Cowboys’ defensive line—Quinnen Williams, Kenny Clark and Osa Odighizuwa—will anchor the new scheme.