There aren't very many Chemical officers either (esp. since for awhile they melded them into Ordnance - that experiment didn't last long though), so whenever things looked interesting on the international scene we began to speculate when we would get The Letter . . . but we never did.
They did call my father in law (another WWII OCS type like my dad, Signal Corps and then Army Air Force) back early in the 'Nam years, he eventually retired as a bird colonel.
Bless them for their service. You must be so proud.