Okay, right up front I'm going tell you that I'm not a lawyer, and this is not to be considered legal advice. If you need legal advice, get a lawyer.
I am assuming from your post above, although you don't say so directly, that you are in one of the branches of the U.S. military. You should know that the Federal government considers you a resident of the state you are stationed in for the purpose of buying firearms from a federally licensed dealer (FFL). You still have to meet all other federal, state, and (if enacted) local requirements to purchase firearms from ANY source, but even if you are maintaining your Georgia citizenship/driver's license/voting rights, you can still buy a gun wherever you are stationed if you meet the rest of the requirements.
The first requirement for a handgun is age. You must be 21 years old to purchase a handgun from a FFL/dealer. No exceptions exist as far as I know, and no out-of-state parental help will get you past this requirement. If you're not 21, and you want a new gun from a FFL/dealer, start saving now so you can get a REALLY nice handgun on your 21st birthday.
If you are not 21, and the state you are residing in allows it, you MAY be able to purchase a used handgun directly from another person, as long as they did not purchase it from a FFL/dealer just to sell it to you. If they are selling a personally-owned gun, and it is not prohibited by state or local laws/regulations, then you MIGHT be able to buy it at age 18 (may be a different/higher age, check state law). If you can buy it legally, get a receipt from the seller stating the date, his name, your name, a full description of the gun (maker/model/caliber/barrel length/finish/etc.) and any/all accessories, the purchase cost, how it was paid, and have both parties sign it. That should be enough to prove you bought the gun lawfully, and if it turns out to be stolen, you can send the cops to whomever sold it to you for further investigation.
Check with local gun dealers, sporting goods stores, state police/sheriff/local police, and/or a lawyer for more laws/regs/details that apply to you in your area.