Dom Capers remains as the defensive coordinator, but the track record of his defenses over the past three seasons have not been very stellar.
When Capers became the defensive coordinator in 2009, the Packers finished second in the NFL in total defense. In 2010, the year the Packers won Super Bowl XLV, the defense was ranked 5th in total defense.
Since then, however, the team has dropped to 32nd, 11th and 25th in that category over the past three seasons.
There have been a number of reasons for the drop off, and injuries have been part of the problem, but the defense has to play better in 2014 for the Packers to have any Super Bowl aspirations.
McCarthy talked about how the defense will change in 2014 when he talked to reporters in early February, via Packers.com:
Our defense is going to change some. You don't ever stay the same. There will be some adjustments. I don't know if you'll notice them. (They'll be) based on personnel, too. That obviously plays into it. We're going through scheme evaluation.
We weren't as multiple as we were in prior years, really because of the stress of the injuries on that unit. We want to get back to doing some of the things we did well in the past, make sure we're carrying enough packages to utilize all of our players.
We also need to get better on defense. I think these moves on defense will definitely put us on that path.
The Packers re-signed some key players who were all unrestricted free agents this offseason to help to bolster the defense. Players like cornerback Sam Shields, defensive lineman/outside linebacker Mike Neal and nose tackle B.J. Raji.
Plus the Packers added a couple of new players through free agency when they signed defensive end Julius Peppers and defensive tackle Letroy Guion.
The Packers can also help their defense a great deal in the first round of the 2014 NFL draft. There is a reasonable chance that the Packers will be able to select an excellent defensive player with the 21st pick of Round 1.
I've listed five of those players in this slideshow.