They'd be better off banning the use of Windows.
That is a very profound statement, and true statement. DoD already has moved toward Apple servers. They should adopt Mac desktops and laptops also. Our troops deserve the best.
Any system can be hacked!!! Not just Windows. If they want a more difficult system to hack, then they need something that is proprietary to the DoD. Apple is JUST as hackable, it's just not as popular so you have less main stream viruses hitting those systems, as is Linux and other Unix based systems.