I went with some other Microsoft folks on a tour of a ballistic missile sub 15 (?) years ago. The missile control room had a PC running Windows NT 3.51. The per

I went with some other Microsoft folks on a tour of a ballistic missile sub 15 (?) years ago. The missile control room had a PC running Windows NT 3.51. The person in charge saw the nervous looks we were giving each other and understood our concern immediately. He assured us the PC was just for keeping logs, and the computer behind us, a thing the size of two large refrigerators that based on appearance could have contained vacuum tubes, was in control of the missiles. We all breathed a sigh of relief.