Air Defense

SM-3

The SM-3 is a Standard Missile family interceptor for Aegis Ballistic Missile Defense ships and Aegis Ashore sites. Unlike area air-defense missiles built around blast-fragmentation warheads, it uses a hit-to-kill kinetic vehicle to destroy ballistic missiles in the midcourse phase outside the atmosphere, with Block IB and Block IIA variants forming a key U.S. and allied upper-tier missile-defense layer.

Conflict side
United States
Built by
Raytheon; Mitsubishi Heavy Industries for Block IIA co-development and components
Built in
United States; Japan
SM-3, Ship- and shore-launched exo-atmospheric ballistic missile interceptor, Air Defense

Profile

Type
Ship- and shore-launched exo-atmospheric ballistic missile interceptor
Conflict side
United States
Origin
United States; Block IIA co-developed with Japan
Service note
Operational from the mid-2000s; Block IB operational from 2014 and Block IIA from 2019
air defensemissile defenseballistic missile defenseSAM

Service History

In service
Aegis BMD shipboard and Aegis Ashore ballistic missile defense service
Used by
United States Navy, Japan Maritime Self-Defense Force, Aegis Ashore sites
Wars
United States-Iran Conflict

Specifications

Role
Midcourse ballistic missile defense interceptor
Launcher
Mk 41 Vertical Launching System on Aegis ships and Aegis Ashore sites
Engagement method
Hit-to-kill kinetic kill vehicle for exo-atmospheric intercepts
Length
6.55 m
Diameter
0.34 m for Block IA/IB; 0.54 m for Block IIA
Range
About 700 km for Block IA/IB; about 2,500 km for Block IIA
Speed
About 3.0 km/s for Block IA/IB; about 4.5 km/s for Block IIA
Guidance
Inertial, command, and midcourse GPS guidance with an infrared seeker on the kill vehicle

Conflict Usage

United States-Iran Conflict
Side: United StatesRole: Exo-atmospheric ballistic missile interceptionair defense

U.S. Navy destroyers used SM-3 interceptors in April 2024 and again in October 2024 during defensive engagements against Iranian ballistic missiles launched toward Israel.

SM-3 Images

Related Weapon Systems

Sources