The Northwoods document was a plan by US joint chiefs of staff to create "false flag" terrorist events to be blamed on Castro's Cuba as a pretext for invading Cuba.
 
"False flag operations are covert operations designed to deceive the public in such a way that the operations appear as though they are being carried out by other entities. The name is derived from the military concept of flying false colors; that is, flying the flag of a country other than one's own. False flag operations are not limited to war and counter-insurgency operations, and can be used in peace-time".   Wikipedia
 
Click here to read the Northwoods document (13 March 1962)