Sure, you can't connect to a DoD network, but military members overseas have access to personal internet.
Hell, I was in Afghanistan and had internet access in my dorm room. What about the people stationed in Japan, who have access to Japanese ISP's in their homes (I know, I was over there).
I honestly can't believe MS is being this dense about this.
You get VPN that solves the issue. both on deployments and stationed in other countries. VPN is what everyone should be using if you are outside of the country you originate from.