The summer issue of International Security has my article on a very interesting period of the Cold War in the 1970s, when the Soviet Union largely achieved "strategic parity" with the United Sates: The Window of Vulnerability That Wasn't: Soviet Military Buildup in the 1970s. The bottom line of the story is that the United States seriously overestimated the capabilities of the Soviet ICBM force - the much discussed "window of vulnerability" never existed. Read the article for the details - it has some interesting data.