12 - 9 NOTE: Avoid permanently marking buildings and rooms, as this may not only cause collateral damage, but will most likely also deteriorate relationships built with local nationals. d. Chemlights and 100 Mile-an-Hour Tape. These are available and reliable. • RED – CCP • GREEN – room clear • ORANGE – UXO • BLUE – clean room • IR – breach point e. Wolf Tail. A simple, effective, easy to make, lightweight device called a "wolf tail" can be fabricated to mark buildings, doorways, and windows. A unit has changed its tactical SOP to require that each Infantryman carry one of these devices in his ACU cargo pocket. Wolf tails, when used IAW a simple signaling plan understood by all members of the unit, can aid in command and control, reduce the chances of fratricide, and speed up casualty collection during urban combat.