Later it came to include additional elements, including the controversial policy of preventive war, which held that the United States should depose foreign regimes that represented a potential or perceived threat to the security of the United States, even if that threat was not immediate; a policy of encouraging democracy around the world, especially in the Middle East, as a strategy for combating the spread of terrorism; and a willingness to pursue U.S. military interests in a unilateral way. Some of these policies were codified in a National Security Council text entitled the National Security Strategy of the United States published on September 20, 2002.
Click through for the full wikipedia entry. I have an idea for a bastardised version of the Doctrine causing the events that kick off my NaNoWriMo tale’s backstory.