Originally commissioned by Chief of Staff of the Army General Raymond T. Odierno, The U.S. Army in the Iraq War is the Army’s interim examination of military operations in Iraq from 2003 to 2011. This study, published in two volumes, is a narrative history that tells the story of U.S. forces in Iraq, mainly from the perspective of the theater command in Baghdad and the operational commands immediately subordinate to it. It focuses at the operational level of war, exploring the decisions and intent of the senior three- and four-star commanders and how these decisions effected the course of the war over time. This work was built from over 30,000 pages of previously unavailable declassified documents and hundreds of hours of interviews with senior defense leaders. While the Army will eventually publish a comprehensive, official “Green Book” history that describes Operation Iraqi Freedom in greater depth, this study is being released now in order that key lessons, insights, and innovations from this period of the conflict are available to the next generation of Soldiers and leaders to study, learn from, and adapt to ensure the future readiness of our Army and the Joint Force.