Arrow-3 Cannot Intercept Hypersonic Glide Vehicles That Maneuver in Flight

Israel's Arrow-3 exo-atmospheric interceptor is designed to destroy ballistic missiles above the atmosphere during their midcourse phase, when they follow predictable parabolic trajectories. However, the emerging threat of hypersonic glide vehicles (HGVs) -- which travel at Mach 5+ but maneuver unpredictably during flight, skipping along the upper atmosphere rather than following a ballistic arc -- falls outside Arrow-3's design envelope. The system's kill vehicle relies on predicting where the target will be at the intercept point, and a maneuvering HGV invalidates those predictions. This gap matters because Iran, Russia, and China are all developing or have already fielded hypersonic weapons. Russia's Kinzhal and Avangard, China's DF-ZF, and Iran's reported hypersonic missile program all represent threats that could bypass Israel's top-tier defense layer entirely. If Arrow-3 cannot engage these weapons, the burden falls to lower-tier systems like Arrow-2 or David's Sling, which are designed for different threat profiles and may lack the engagement geometry to intercept a hypersonic threat descending at extreme speed and angle. The strategic consequence is that nations investing billions in layered ballistic missile defense may find their top layer neutralized by a single class of new weapon. Israel spent decades and billions of dollars building the Arrow system specifically to counter Iran's ballistic missile threat. If Iran fields even a small number of hypersonic weapons, it can potentially bypass that investment entirely and hold Israeli strategic targets at risk despite all defenses. This problem persists because intercepting a maneuvering hypersonic target requires fundamentally different sensor and interceptor technology than engaging a ballistic missile. The tracking radar must maintain a fire-control-quality track on a target that changes course unpredictably at Mach 5+, and the interceptor itself must have enough fuel and agility to correct its course in the final seconds before impact. Current kill vehicles are optimized for the relatively simpler problem of hitting a predictable ballistic target in space. Structurally, defense technology development cycles are slower than offense. Developing a new interceptor from concept to deployment takes 10-15 years, while adversaries can field new offensive weapons faster by leveraging dual-use technologies (hypersonic research for space launch, materials science, etc.). The Arrow system's architecture was locked in during an era when ballistic missiles were the primary threat, and adapting it for hypersonics requires not just a new interceptor but new radars, new battle management software, and new engagement doctrines.