Thank you for your service
Nothing wrong with buying a used bow. I have only bought a couple of new bows, most have been used.
Couple of key points to look for in buying a used bow:
-have your draw length checked at a local bow shop. Buy a bow that fits you, don't try to fit the bow.
-I would shoot different bows. Many bow shops will let you pick and choose.
-Brand isn't as important to me as feel. Speed doesn't make a difference either, I shoot for consistency.
-Unless you know and trust the person you are buying from, have a bow tech inspect the bow before buying. With a newer bow, it is difficult for someone to mess one up beyond repair, but some people don't take care of their equipment
-Don't discount a bow because of looks or scratches. Just because it has been used and has a few "war wounds" doesn't mean that the hunter didn't take care of it. Chances are, the hunter is one that hunted hard and made sure his equipment was truly in hunting condition
Budget would be the driving factor for me if I was buying a bow, used versus new.
Good luck to you sir