problem is volume, everyone in the military brings back their allotted 1 car for personal desire/use so you gotta convince them to sell it to you and why would they sell for less than market value?
Otherwise you end up having to spend many thousands in shipping and import costs.
a precursory look on google shows there are many such businesses that do this, though. an example:
CAR FROM JAPAN is a leading platform to import Japanese used cars from JAPAN. Discover 100,000+ high quality vehicles at affordable prices, ready for global shipping. Start your search today!
carfromjapan.com