So glad you posted! I hope other members weigh in with the decisions they made when selling their vehicles before an overseas move.
Have you tried listing it on aps like OfferUp, CraigsList or Facebook Marketplace? You could also post for sale on your local base/post social pages?
Other options include possibly donating it and collecting the tax benefit or depending how long you will be stationed overseas consider storing it.
Wish you best of luck on your upcoming move! Let us know how we can help in other ways- an overseas move is no easy task!