I'm not worried about an exocet or even a cruise missile coming in during a combat action. They've got R2D2s (Phalanx CIWS) to deal with those vampires and they work real good. Even a top line Russian Mig with their best pilots would have a hard time getting into engagement range. And then there's the story about the USS Ronald Reagan having directed energy point defense. The nickname for CVN 76 is "The Ronny Ray Gun." I got a non-denial denial on that rumor from a senior chief involved in the build out of the CIC and the RRs shake down cruise as his final assignment before retirement.
No, I'm worried about a carrier battle group steaming into the Persian Gulf during some conflict and sailing over a previously placed nuke left on the bottom by the Iranians. There's no way to defend against that.
AWACS isn't too effective against cruise missiles or submarines, and your antisubmarine and antimissile capabilities are not what they're cracked up to be. Asymmetrical warfare and all that.