Without warning, the rifle discharged, tearing a hole through the floorboard of the car of an Army colonel. The rifle belonged to a young lieutenant who had been invited to go hunting with the colonel. Though no one was hurt, the incident left everyone in the car shaken. Worse, the lieutenant had shot his own career in the foot, according to executive coach Bruce Sillers, who was a member of the lieutenant's battalion at the time of the incident. You may never have recklessly discharged a firearm, but if you want to blast a hole in your career, there are plenty of weapons available, from a hair-trigger response to an e-mail to a faux pas at a company party. Here are five big no-nos to watch out for.
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