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Could it be anyone else?
The Steelers' amazing defense currently ranks first in yards allowed per game and second in points allowed per game, even when facing explosive offenses week after week.
Pittsburgh boasts some of the most feared defenders in the NFL. These include superb pass-rushers James Harrison and Lamar Woodley, who have combined for 17 sacks.
Those two beasts, along with elite inside linebackers Lawrence Timmons and James Farrior, form one of the league's best linebacker corps.
The Steelers run defense ranks among the best in the game, as monstrous nose tackle Casey Hampton shuts down opposing running backs.
The Steel Curtain's secondary is also one of the best in the league.
Safety Troy Polamalu is one of the most feared defenders in the game today. He is a complete player, as his skills range from rushing the passer to covering some of the league's most dominant wide receivers.
The secondary also included safety Ryan Clark, who is responsible for some of the most bone-crushing hits in recent history, and underrated cornerback Ike Taylor.
Pittsburgh's defense is far and away the most feared unit in the league. Opposing offenses dread facing this completely unmerciful group, especially in Heinz Field.