^^^ The fake National Guard guys last week were probably foreign, with the one guy referring to the US as "your country." It could be some sort of separatist group of Americans, but the implication to me was that they were foreign (possibly trained as infiltrators with American accents and cover stories).
Also, they left it up in the air whether the terrorists on the plane were tipped off from someone on the ground or if they just had a hunch that something was going on on the plane after the stewardess tried to open the cockpit and decided to divert. But Mac thought someone in the Mexican Special Forces unit had tipped off the hijackers.
The hijacking was intense, and it really shocked me when they killed the poor old lady in the bathroom. It's been a very good couple of episodes so far.
The whole thing with giving the wives new identities and numerous agents watching them is stupid though. Their natural inclination is going to be to rebel in that situation, and having to learn a new identity opens up the possibility of screwing up. They would have been better off sequestering them to their homes on base with protection and bringing in teachers for the kids. If it's a trust issue, they're already relying on agents they have to trust anyway, but in a much less secure location then on the base itself.
I don't care how much they support the lifestyle of the unit, I'd never forgive them if they kidnapped me and kept me away from my kids, and I'd want nothing more to do with them. This whole thing stretches credibility, especially since the kids are in danger themselves being out there with the elderly parents and minimal guard.