Andrew J. Bacevich is professor of international relations at Boston University where he also serves as director of the university's Center for International Relations. He is the author of The Pentomic Era: The U.S. Army Between Korea and Vietnam.Eliot Cohen is professor of strategic studies at the Paul H. Nitze School of Advanced International Studies, Johns Hopkins University, where he is also the founding director of the Center for Strategic Education. He is the coauthor of Revolution in Warfare?: Air Power in the Persian Gulf.