IIRC most of those orders have authentication codes for similar reasons. The software designer would have to obtain those first.
Are we talking about run of the mill orders or shooting nukes?
An enemy having the ability to give our subs orders to move to a specific point is a huge benefit. Even confusing them and making them surface (or close to) in order to get better comms is a huge advantage.
I can personally come up with hundreds of ways to seriously fuck with the .mil through computer code that does not involve the release of ANY weapons.
