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As important as it is to act quickly, it is even more important to act. Period.
During the stalking (stealth and concealment) phase of the Navy SEAL sniper course, students are tasked with sneaking up unobserved to within meters of their instructors, experienced snipers who are looking for them with high-powered optics, and take a shot, either a blank or, in some cases, a live round fired at a steel target.
When I was the head instructor of the program, it amazed me how often I saw students make the stalk successfully, get within range, set up position for firing with time to spare, but never take the shot. They would be sitting there in their FFP (final firing position), checking and rechecking their camouflage. Going back over their mental checklist to