If you wanted to spend a few years making a decent living and having a good time (and putting what you learned in the service to good use), you might want to consider getting a job as a genny tech.
Now, most guys who do that babysit rigs on construction sites and probably want to kill themselves out of boredom, but you could work for a company that does entertainment electrical distribution and I think you'd probably have the time of your life.
We use Aggreko when we need on site power and some of those guys go from doing our piddly-ass parties to spending six weeks at Lollapalooza and then straight to Burning Man for a month and then on to god knows what, but from what I've been told, it's not a bad way to turn a buck if you don't mind working hard. They get put up in decent hotels and treated pretty well (except for Burning Man, which is campers, but at least they have A/C.) You can even fly your wife out if you get lonely.
And hey, if you do like it and want to make it a career, there's always that option, too, but in the meantime you could spend a few years just doing it for shits and giggles.
If you're hell-bent on doing good deeds or making a difference in peoples' lives, don't go this route, but if you want to earn some cash while having a good time in a position that you could probably step right into tomorrow, think about it.
As for not knowing what to do, a lot of people feel that way, and just so you know, nobody really knows what they're doing, everyone's just trying to figure it out as we go along. Anybody who tells you differently is selling something (to paraphrase William Goldman.)