Alea,
The DOD and Chinese and a few other nation states have the same capabilities as each other as far as cyber hacking and attacking goes.
The white papers and strategy papers concede that the persistent adversary that is well funded will get into your system.
The deal is to make it as cost prohibitive as possible for the layer of crooks/bad guys below the nation states.
Raising the bar as I said before.
There will be lots of layers of computer security in the really highly classified areas, but even then where there is a will there is a way. JMO
The industry wants to sell bigger and better locks and safes and ID management tools to the Governments of the world.
Nothing's perfect in this world (can't speak for Doma's