A sound perimeter uses layered defense — early warning layer, outer delay layer, and inner defensive positions. Define your perimeter sectors here, assign personnel responsibilities from your Roster, and document the logic behind your position layout. No classified information — describe using compass bearings and distance from reference points only.

Dead ground is terrain that cannot be observed or engaged from a position — every defensive layout has it. Identifying dead ground before it matters means you can cover it with an alternate position, wire obstacle, or early warning device. Interlocking fields of fire ensure that the dead ground of one position is covered by an adjacent position. Document both here.

Challenge and response prevents fratricide — shooting your own people in low-visibility or high-stress conditions. Every member of your group must know the current challenge/response pair. Rotate pairs regularly — weekly minimum in an active scenario. Include a duress word — a specific response that tells the post the person is being coerced. The post acknowledges normally but initiates the threat response protocol.

Rules of engagement define when force is authorized, what level of force is appropriate, and who has authority to escalate. In a grid-down scenario, these decisions need to be made in advance — not in the moment under stress. A clear ROE framework also protects your group by ensuring everyone is operating from the same standard. This document is for internal use only.

A sector sketch (range card) documents what a specific position can engage, what it cannot, key range references, and the position's relationship to adjacent positions. Each position that will be occupied during an alert or watch should have a sector sketch. These are printed, laminated, and left at the position — not carried by the person manning it.

Print these outputs and laminate them. The challenge/response card and ROE card are small enough to carry in a chest pocket. Sector sketch cards stay at the position.