I think Garback knows that he's one of the country's best shots at ending the war, that's why he's always pushing his squad and himself so hard in hopes that their sacrifice can save the lives of millions more.
Probably just turned himself in for kidnapping. It's in one of the pages where he says he would never regret kidnapping her. As for the daughter living away from him, it's implied that she's aware that he intends to turn himself in, and knows that he wants her to be able to live a life without...