First off, thank you for your service to our country, second, you need to have your head examined to find out early why you want to spend good money for a vehicle that will require more money and time to keep it on the road. Lol,
Third, read every thread on this forum about importing Defenders. Must be over 25 years old, original engine just for starters. You should get help or at least advise from someone that knows what they're doing. There are people on this forum that import for a living and know how to avoid the problems of importing, I would a send message to Uncle Douglas. He is well known on this board for all things Defender.
Good luck, and welcome,