HELENA COBBAN completed most of this study while she was a Social Science Research Council-MacArthur senior fellow in International Peace and Security Studies. She is currently a scholar-in-residence at the Foundation for Middle East Peace. She contributed to and edited a monograph on The Military Dimensions of Soviet Middle East Policy (1988) and has published articles on the U.S.-Israeli strategic relationship. She also authored The Palestinian Liberation Organization: People, Power, and Politics (1984) and The Making of Modern Lebanon (1985).