The RIM-161 Standard Missile 3 is a ship-launched and land-based Aegis ballistic missile defense interceptor. Unlike traditional anti-air missiles, SM-3 is designed to intercept ballistic missiles in space using a kinetic kill vehicle rather than an explosive warhead.
SM-3 variants use booster stages to carry a kinetic warhead outside the atmosphere, where it collides with an incoming ballistic missile target. This makes the system central to regional missile defense for U.S. and allied forces, especially when integrated with Aegis ships, Aegis Ashore sites, and tracking sensors.
SM-3 is strategically significant because it gives mobile naval forces and fixed Aegis Ashore sites a way to defend against ballistic missile threats. Its deployment with Japan, Europe, and the United States links naval combat systems directly to broader homeland and regional missile-defense planning.
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