All CASE Squad it is! Good by me.
So, while I was reviewing characters once again, I realized that the character sheet is actually missing an entry, and that we'd kind of all missed a step in character creation. On page nine, step six of character creation, there's a list of traits. You take two of them, and gain a XP for each one you use on a given operation (I'm used to this mechanic being tied to a Crew's reputation, which is how it slipped the net). I certainly don't want to be cheating you guys out of XP.
Also, just as a thing, give a bit of thought to what your Armament is. It's a signature weapon, after all, it should say something.
Isaac is looking good. If you're looking for the standing space military, you'll want the Sol Defense Force. Having connections to the Cygnus Group through his wife also isn't a stretch -- could be something convenient to Flashback for in the future.
Seth just needs a little touch up. Your Past and Future are both short an Action, though you have the right number of them marked on your Attributes list. Niggling detail, no big thing. I appreciate mercenary attitude, but given his profit motive, would you rather have had him been a Mercenary than directly tied to CASPR? Cerberus used to be three, separate merc groups before they put aside their differences to take a shot at CASPR, those are connections you can pull on later. Also, just a small point, my intention is to lead things off with the procurement of a ride for the Squad to get to Mars, so I'd rather avoid having Seth left on Mars (this is also to make sure all PC's have the same level of exposure to the Invaders at the start).