During my first week in Ranger Battalion I joined my platoon during a live fire. I wasn’t even allowed real bullets because I was so new. For a portion of the exercise I was on a hill watching the training of another platoon. I was in earshot of an old Ranger first sergeant. The Rangers in training were assaulting a constructed plywood building and were preparing to conduct an explosive breach on the plywood door. The team leader quickly applied the charge with double sided sticky tape and stepped back into the stack, pulling both detonators. “Failed Breach, Failed Breach!” was yelled. It was obvious the detonation cord was faulty.
Source: Reflections on Rangering