The classic military view of secrecy is time-limited. "Where the ship was last week is unclassified. Where the ship was yesterday is confidential. Where the ship is now is secret. Where the ship will be tomorrow is top secret." The opposition will eventually find out what you're planning on doing. The goal is for them to find out the hard way, when incoming fire starts hitting them.
The intelligence community has a longer-term view. "We know, and they know. We think they don't know that we know they know. We hope they don't know how we found out that they know." This protection of sources mindset leads to things being kept secret long after all involved parties know.
The anti-terrrorism community has adopted the intelligence community mindset. This is a problem.