I worked in a company that made CNC machine tools at the time of the Challenger disaster. The actions of Roger Boisjoly gave me the courage to reject a demand from management that I add a &quot;feature&quot; to a control system I was working on to disable all safety lockouts from a single virtual switch.<p>I refused the assignment. When they didn&#x27;t fire me on the spot I followed the managers who made the request and when they would ask another engineer to do it, I would warn the engineer that they could be held personally responsible for any injuries or fatalities that could occur.<p>I fully expected to be fired but surprisingly, management just gave up on the idea. Perhaps my insistence that it was a bad idea convinced them.