Semper Fi Devil Dog! Yes Afghanistan would be one hell of a place to ride, spent some time up in RC North, that being said go with the BMW GSA! I have this bike and love it! Its beast at time off road at times but I enjoy it more and more I take it off road. The road touring is top notch.
I hope one day I can travel to Afghanistan on bike and see things not having to worry about the war catching up with me, even though that wouldn't stop me from doing it anyways!
Stay safe, and remember get the big BMW with that deployment money