Almost certainly a grunt officer who's good as his job, but at the same time would just like to be living a normal life without the complexities of fighting a war. Definitely not an objector or someone "unwillingly" or "accidentally" thrust into the war (like Kira).
Personally, I wouldn't have a problem serving in the military during a war because I intend on volunteering for the military after I graduate from college, anyway. So I'd get my 4-year degree, at least, and then I'd volunteer for the military, entering officer training shortly thereafter.
I'm not a particular fan of mechs, so I'd prefer to be an infantry officer. As long as there are wars to be fought and battles to be won, there will be infantry. So even in the unlikely event our world ever is like a Gundam series, there will be infantry right there along with the MSs. I'm definitely a problem solver in real life, and I don't stop until the job is done. I'd find any way possible to defeat even a technologically-superior enemy with simple American ingenuity and resolve.
Also, I get what I want. I don't alienate people to do that, but I get what I want. I'd probably be that maverick officer who gets around regulations by some loophole, and gets better supplies his unit shouldn't get because he has "contacts" with the Quartermaster and S4 (supply officer).
Since I'm just a student, my current "profession" really doesn't have a bearing on what I'd like to do. But, I am a Summer Session mentor and a TA (and hopefully soon to be a THON OPP Captain), so I guess my extracirriculars mirror how I'd like to be an infantry officer, leading a group of soldiers (as opposed to college students... though I treat some of my kids like soldiers in terms of discipline when they don't do what they need to do!
"I SAID USE MLA FORMAT AND NONE OF YOU DID! DROP AND GIVE ME FIFTY!").
My personality while leading groups is fairly effective, I think, and something I've learned from several of my family members (most of whom are military or ex-military). I'm not an "evil boss," as I prefer my group members to like me and feel comfortable with me leading them. At the same time, I expect them to follow orders when I give them. If they trust me, they're more likely to follow what I say. And I would never ask a soldier to do something I myself wouldn't do.
As a student of military history, I may not agree with everything behind why a particular war is fought, but I think the duty of serving one's country is more important than that. It's always possible that as a simple soldier and civilian you just can't understand the ramifications of the war (the bigger picture, I mean... You're not aware of the bigger picture. Not that you can't "understand" the war because of lack of brain power or something).
In a strange twist, I think it would be extremely interesting to be born a Coordinator on Earth and live there my entire life and join the Earth Alliance. Of course, I'd have to keep me being a Coordinator a secret for my life, but I think it would be very interesting to have a Coordinator in the EA who doesn't care if people are Naturals or Coordinators, but instead only cares about protecting his home planet, where he's lived his entire life. It's more important to protect his family, friends, and planet than to side with those who are "like" him.
Actually... This isn't going to go over well, but...
I'm doing an OC fic for GS/D about what I just said. ^^; Yes, OC. I did, in fact, say OC. I know that's terribly frowned upon, but that's just how I write.
Oh, and I'd definitely do one thing: Serve aboard the
Archangel as the ship's security forces and "teach" Kira how to be a soldier. The first half of that series where he does nothing but whine... GAWD! >_< I'm surprised the writers didn't have Mwu talk to him! I mean, Mwu is a seasoned pilot who has killed people before. Have the guy talk to Kira and tell him to "Suck it up, kid" or something! I mean, you CANNOT have Kira breaking down in the middle of combat and getting someone else killed... So as a seasoned soldier I'd have to sit Kira down and dress him down (it's a figure of speech, people... Not ACTUALLY dress him down...) about how he needs to suck it up and not break down in combat "or we're all gonna die." Which is something I do IRL... But obviously not over something as important as a war! lol No, more like at sports practice (when someone wants to give up) or in group work, etc. Like I said earlier, I never stop until the job is completed, whether I want to go on or not. I make sure everyone completes the goal.
Hoo-ah!