Yeah, it was a fractional orbital bombardment system situation. Also was used in Warday. I always thought the assumption that space would be off limits in a conflict was questionable at best. If you're willing to use a nuclear weapon, or even look at one while you're thinking about using it, you're going to be willing to do whatever you have to do in space.Note particularly the nature of the payloads. Not having a military background but being an avid Clancy reader from years ago I seem to remember something like this happening in one of his books before a conflict started.