No networked computers? I do not believe you. Even my little soft-skinned two-person wheeled command vehicle has a network of about twenty discrete computer systems, such as multiple radios, GPS, displays, input terminals.
Reminds me of Battlestar Galactica, where the all the ships in the fleet get hacked by Cylons, have their shields taken down and promptly destroyed, but Galactica survives because it's computers aren't networked.