The definitive guide to physical security from the U.S. Army — ATTP 3‑39.32 lays out the time‑tested doctrine for securing installations, safeguarding personnel, and protecting critical assets. Inside, you’ll find comprehensive coverage of threat assessment, security planning, site design, barriers, vehicle control, lighting, electronic security systems (ESS), access control procedures, key‑control and locking systems, and the roles and responsibilities of security forces. This manual offers a “defense‑in‑depth” framework suitable for installations, corporate facilities, private security firms, and anyone serious about professional‑level protection. Whether you’re preparing for facility hardening, planning access control protocols, or training security personnel — this book equips you with the principles and procedures used by the U.S. Army to defend against espionage, sabotage, theft, and terrorism.