Andrew J. Bacevich, Sr. is an American historian specializing in international relations, security studies, American foreign policy, and American diplomatic and military history. He is a Professor Emeritus of International Relations and History at the Boston University Frederick S. Pardee School of Global Studies. He is also a retired career officer in the Armor Branch of the United States Army, retiring with the rank of Colonel. He is a former director of Boston University's Center for International Relations , now part of the Pardee School of Global Studies.Bacevich has been "a persistent, vocal critic of the U.S. occupation of Iraq, calling the conflict a catastrophic failure." In March 2007, he described George W. Bush's endorsement of such "preventive wars" as "immoral, illicit, and imprudent." His son, Andrew Bacevich Jr., also an Army officer, died fighting in the Iraq War in May 2007.