What happened: The Steelers shared a tribute remembering safety Mike Wagner on his birthday. Wagner was a key piece of the Steel Curtain secondary that anchored Pittsburgh's dynasty through the 1970s. The unit is regularly invoked whenever the all-time great defenses are debated.

Why it matters: That Pittsburgh defense backed four championships across the decade, pairing a dominant front seven with a ball-hawking secondary that Wagner helped lead. Modern defenses have had standout single seasons, but few can match a group that stayed elite long enough to anchor a dynasty.