Here is a presentation by rspawn of YouTube
He writes, referring to his video compilation:
On more than one occasion there have been war games or military exercises regarding terrorist attacks that coincide in time, location and methods with actual terrorist attacks that have taken place.
1. General Meyers giving some details about the war games that took place on 9-11-2001.(C-SPAN footage)
2. mr Power describes the terror exercises his security company was involved in on 7-7-2005 in London.(from "Mind The Gap")
3. Three Russian secret agents arrested in connection to a thwarted bomb plot in Moscow in 1999, later claimed to have been an exercises. (from "Disbelief")
4. US undercover operatives involved in an attack on a barracks in Belgium, later claimed to have been a canceled exercises. Stolen weapons turned up at a militant communist group.