Terrorists at the Office of the Joint Chiefs?

This is something I was unaware of, if it's true. A former US army intelligence officer, David Dionisi, says that the US Joint Chiefs of Staff once planned an attack against our homeland in order to blame it on Cuba:

They also need to understand their history. In 1962, the Joint Chiefs of Staff presented a plan called Operation Northwood, which is now declassified. It proposed conducting mass casualty attacks on American targets and blaming it on Cuba to rally public support for war against Fidel Castro. President Kennedy rejected the plan. So we shouldn't just assume any future attack on our soil is the work of al-Qaida.

Sometimes, when I'm in my most paranoid, conspiracy theory oriented moods, I've suspected someone like Bush might do something like this, but if such planning is standard practice at the Pentagon, that's really scarey.