Hum, not sure that Farben was involved with armaments per se. But they were vital nonetheless to Germany. Synthetic rubber in particular. Let us not, of course, forget Zyklon B.
Edit: Sometime back, The Texas Observer had a wonderfully weird story about Laredo using Zyklon B on humans, but for the way more benign purpose of (I think) delousing border crossers. Really should look up that piece again. It implied that Germany might have learned of the chemical from this usage.
