Physical Protection of Critical Infrastructure

This Joint Interagency Task Force 401 guide reframes critical infrastructure protection for the modern drone threat. Traditional access control models are insufficient against small unmanned aircraft systems (sUAS) that operate from stand-off distances. The report introduces the “HOP” framework—Harden, Obscure, Perimeter—offering practical, non-technical measures such as overhead netting, structural shielding, visual obscuration, and expanded security perimeters. Designed for local authorities and infrastructure operators, the guide emphasizes layered, outward-looking defenses that reduce drone risk without relying solely on advanced counter-UAS systems.