Given that the MoD has just demonstrated it has no serviceable warships, submarines or even a remotely workable plan to respond to events that the whole of the rest of the world knew weeks ago were just about to happen, I'm not sure that the release of a few pages of processes detailing how inept the security services are at finding an errant drone represents any kind of significant threat to national security.
Please just release the docs, accept the ministerial resignation, do the obligatory u-turn, and get on with life...