for starters your orders will determine whether you can bring a car back or not at government expense (they will do all the work too). secondly, bringing a car back and the costs involved in making it legal for the roads in america is based on the car. some require more modifications than others. if you want to get one here and ship it back, its not too hard. get your personnel office to add it into your orders when you go to pcs back (most will unless theyre *****), just be sure to find out what the costs are and save to have the car modified. but remember, you get what you pay for. if youre lucky enough to find a nice car with a low price, its either got alot of miles or something wrong with it. in the extremely rare case, theres nothing wrong with it and someone is just tryin to be rid of it (cant leave until its signed over to someone else). also, get whatever car you want.
now, the question at hand...if you like your car, keep it. nothing wrong with that. mine sits in the garage at my house to use when im on leave and for when i pcs back next year. and its almost paid off. so not only will it reflect good on my credit but it'll be 100% mine. good enough reason to keep it in my book.
got any questions, feel free to pm me.