My brother-in-law is a marine, and he served in Iraq and Afghanistan. He once told me that they would sometimes face an odd challenge when they would experience their first time in firefights. Some soldiers would collect their spent brass in the middle of combat. It seems weird, until you recognize that, in the intensity of those situations, fight-or-flight kicks in and folks replay what they did in training. This includes collecting their spent brass after they finished shooting. It’s a crazy reality that however we train is a strong indication of how we will act when difficult situations ari...