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To shield yourself from being seen through a peephole when approaching a door without having to hold your finger over the hole, carry a piece of duct tape (black, of course) either in the inside flap of your cuff case or on the stock of your rifle. Whoever is point, point-cover, or up-front can take it off and stick it over the peephole and step back.
*Do not use gaffer’s or electrical tape; they don’t stick well in cold or humid weather.