The Bills' defense remains largely intact from last season, and that has an aggressive unit that allowed 17.8 points per game (seventh best in the NFL) wanting more.
"We're never satisfied with our performance," linebacker London Fletcher said. "We understand teams are going to be gunning for us. They're going to be better prepared for us this season coming up, so we know we kind of have the bull's-eye."
The defense excelled during the second half of the season, when the Bills won six straight games before losing on the final week of the regular season and missing the playoffs. Over those six wins, Buffalo held all but one team to 17 points or fewer and limited three opponents to nine points or fewer.
The only major loss is defensive tackle Pat Williams, who signed with the Minnesota Vikings. Ron Edwards becomes the starter after playing last season as a reserve. He'll have plenty of help and face few if any double teams playing next to Pro Bowl selection Sam Adams.
Watch out for the Bills' young and aggressive defensive ends, Aaron Schobel and Chris Kelsay. Schobel was named a Pro Bowl alternate last season. Kelsay became a full-time starter midway through last season and finished with 41/2 sacks.
The secondary has plenty of experience with safeties Lawyer Milloy and Troy Vincent and cornerback Nate Clements. The other starting cornerback is Terrence McGee, who filled in for Vincent last season at cornerback and made the Pro Bowl as a kick returner.