Advice you didn't ask for and probably don't want to hear, but I wish I had heard it when I was a new Lt:
Do not take out any kind of loans. Period. If you want something, save for it. If you need a car, get something you can pay cash for, and then take what you would be paying on a car payment and save that away until you have enough to "upgrade" at a later date.
Contrary to popular belief, you do not HAVE to have a car loan/personal loan like it's some sort of pet. Avoid debt and use that sweet income you are going to be making to pile up cash. Start maxing out a ROTH IRA ($5,000/year = $416.66/month). Avoid credit cards like the plague even if they offer sweet sounding "rewards". I know this involves some delaying of pleasure and sounds boring but you are only cheating yourself if you don't start right away.
For those of you that would talk about the ridiculously low interest rates and how you can take advantage of them -- well, probably not much I can say to you other than people who are millionaires (which you can be) didn't get there by taking advantage of low interest loans and credit card rewards. If you do insist on borrowing money, pay it back ASAP (like, double-triple payments at a minimum). As a borrower, you are slave to the lender.
Finally, the most valuable book (in my opinion, and no, I don't work for him, but I am a huge believer in his ideas) is Dave Ramsey's "Total Money Makeover". Go buy it off of Amazon. Yesterday. Seriously. It's the best thing you can read this early in your career.
Best of luck and congrats on making it this far.