The Standard Missile-6 is a U.S. Navy ship-launched multi-mission missile for anti-air warfare, terminal ballistic missile defense, anti-surface warfare, and strike missions. Its conflict record is strongest in Aegis shipboard air-defense roles, including U.S. destroyer and cruiser defenses against Houthi missile and drone attacks in the Red Sea.
During Operation Epic Fury, CSIS assessed that ship-launched SM-3 and SM-6 interceptors saw lower use than ground-launched missile-defense systems, while CENTCOM listed guided-missile destroyers among U.S. assets employed in the campaign.
During the Red Sea crisis, U.S. Navy surface forces fired SM-6 missiles as part of shipboard defenses against Houthi attack drones, ballistic missiles, and cruise missiles.
Role detailsSM-6 records mix block names with mission-capability labels: Block I and Block IA are the main fleeted variants, Dual I and Dual II describe sea-based terminal missile-defense capability sets, and Block IB is the longer-range follow-on.
| Variant | Configuration | Designation notes |
|---|---|---|
| SM-6 Block I | Extended-range fleet air-defense baseline | The Navy fact file identifies Block I as an extended-range anti-air warfare missile with over-the-horizon capability, active and semi-active seeker modes, and Raytheon as contractor. Sources: Standard Missile |
| SM-6 Block IA | Improved air-defense and expanded mission variant | DOT&E describes Block IA as improved against advanced threats and reports that the Navy completed live-fire operational testing against subsonic and supersonic aerial targets in 2018. Sources: DOT&E FY2018 SM-6 |
| SM-6 Dual I | Sea-based terminal ballistic-missile-defense capability | DOT&E reported Dual I as a fielded SM-6 capability for terminal defense against short- and medium-range ballistic missiles, anti-ship cruise missiles, and aircraft. Sources: DOT&E FY2018 SM-6 |
| SM-6 Dual II SWUP | Enhanced ballistic-missile-defense test configuration | MDA reporting identifies Dual II SWUP as an upgraded sea-based terminal configuration used in 2023 and 2024 medium-range ballistic missile intercept tests. |
| SM-6 Block IB | Longer-range Block IA modification | DOT&E describes Block IB as a Block IA modification intended to extend engagement range with a new second-stage rocket motor, with fleet delivery expected in FY27. Sources: DOT&E FY2022 SM-6 |
SM-6 is launched from Aegis-equipped ships through the Mk 41 VLS.
| Launcher | Launcher type | Launch evidence |
|---|---|---|
 | Shipboard integrated combat system | The Navy's Standard Missile fact file says SM-6 is part of the Aegis ship-defense architecture and is launched from shipboard vertical launch systems on Aegis ships. Sources: Standard Missile |
 | Guided-missile destroyer | MDA reported USS Preble launched SM-6 Dual II SWUP missiles during FTM-32, and the Navy DDG 51 fact file identifies USS Preble as an Arleigh Burke-class destroyer with Aegis, Mk 41 VLS, and Standard Missile-family armament. Sources: DVIDS MDA SM-6 FTM-32, Destroyers (DDG 51) |
SM-6 is best read as a shipboard Aegis weapon rather than a standalone missile round: the missile receives midcourse control through Aegis ship sensors, then uses active seeker guidance or ship illumination in the terminal phase.
DOT&E describes SM-6 midcourse flight control as coming from the Aegis Weapon System through the ship's radar.
The missile can complete the terminal phase autonomously with its active seeker or with support from the ship's illuminator.
Raytheon and DOT&E connect the seeker and guidance electronics to technology developed for the AMRAAM air-to-air missile program.
Sources: DOT&E FY2022 SM-6; Raytheon SM-6 Initial Operational Capability; Standard Missile.
Raytheon announced the U.S. Navy's first SM-6 deployment and initial operational capability, noting deliveries under low-rate production and the start of full-rate production orders.
Sources: Raytheon SM-6 Initial Operational Capability
DOT&E reported that the Navy declared SM-6 Block I full operational capability in December 2017 after follow-on test and evaluation work with Aegis Baseline 9 ships.
Sources: DOT&E FY2018 SM-6
DOT&E reported SM-6 Block IA firings against subsonic and supersonic aerial targets at Point Mugu during operational testing completed in August 2018.
Sources: DOT&E FY2018 SM-6
DOT&E reported that the Navy transitioned SM-6 Block IB from a Middle Tier of Acquisition program into the SM-6 ACAT IC program in November 2021.
Sources: DOT&E FY2022 SM-6
The Missile Defense Agency said USS Daniel Inouye launched two SM-6 Dual II SWUP missiles and intercepted a medium-range ballistic missile target during FTM-31 Event 1a.
Sources: MDA SM-6 Dual II SWUP Test
MDA and the Navy reported that USS Preble launched SM-6 Dual II SWUP missiles and intercepted an advanced medium-range ballistic missile target during FTM-32.
Sources: DVIDS MDA SM-6 FTM-32, RTX SM-6 FTM-32
