I agree, that is the case in real life. The show mainly focuses on the portions of their lives that immediately surround (& during) the missions. IMO we don't see the stretches of time when life is more normal for them. IMO, I don't think its much different than a medical show having surgeons perform ground breaking surgeries every week, lawyers in court arguing huge cases every week, etc. All the drama is heightened. I also don't think the show started all military and nothing with their lives - we saw Jason struggling personally after Nate died in episode 1. JMO.