212 Squadron - "The Old Man's Eyes And Ears"
Yeah, the leviathan DLC clears stuff up a bunch too. Would have been nice to have that in the initial release. I finally started playing the Omega DLC... That was probably one of the biggest glarring omissions that bugged me at launch, since the game teased at a big fight to take back Omega but just avoided the issue.
That might be because no one really cared about Omega.