The United States has been conducting peace operations under various names throughout its history, while never defining these tasks as a core mission. However, the combined effects of the end of the cold war, involvement in the Balkans and the post-conflict reconstruction of Iraq are leading the United States to embrace the full spectrum of operations. Since 2004, new doctrine has been published and new concepts introduced, reflecting a more holistic approach to peace and stability operations. The majority of US military personnel now have experience in these missions. Both services have been re-examining their own history, dusting off and republishing the counter-insurgency and small war writings of the past 100 years. It remains to be seen whether the doctrinal shift away from large conventional wars is permanent or a temporary response to recent events.