I've never made it very far through Gravity's Rainbow (although I have tried multiple times) but I'm pretty sure it's about the ballistic V-2 missiles rather than the cruise-missile like V-1s.
That's true. It's about the V-2s (in particular, one mysterious weapon the Germans appear to be building called the "Schwarzgerät," with serial number 0000).
But that business of trying to figure out whether the bombs are random or not is central to the book. There are a lot of statisticians running around trying to figure out why the pattern of bomb blasts corresponds to the Poisson distribution.
(Of course, there's also a character whose erections appear to predict bomb blasts. Postmodernism, ftw).
