I say this all the time, but I always get mocked for it. "There are hundreds of thousands of Americans with clearance, how are we supposed to administrate that without computers."
But what's the alternative? Even if you air gap things very, very aggressively you still get owned. The CIA has said that air gaps have never stopped them. Ok, so what are we going to do? Getting data out from computer systems is too easy. Things should be pen and paper and maybe specialized typewriters (there are ways of bugging typewriters or using sound recordings of the typing to reconstruct sentences).
At the very least we should keep our foreign agents out of our databases.