Stand-in Attack Weapon
The AGM-88J SiAW (Stand-in Attack Weapon) is a tactical air-to-surface missile under development for the United States Air Force (USAF) by Northrop Grumman. It is primarily designed to attack air-defences and high-value targets such as command-and-control sites, surface-to-surface missile launchers, anti-satellite systems, and GPS jamming systems.
Also recorded as SIAW
Stand-in Attack Weapon

Staff Sgt. Blake Wiles · Public domain
- Name
- AGM-88J SiAW
- Field
- air-to-surface missile
- Region
- United States
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Documentary summary
The AGM-88J SiAW (Stand-in Attack Weapon) is a tactical air-to-surface missile under development for the United States Air Force (USAF) by Northrop Grumman. It is primarily designed to attack air-defences and high-value targets such as command-and-control sites, surface-to-surface missile launchers, anti-satellite systems, and GPS jamming systems.
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wikidata · Q123560571
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Key facts
Key facts
• Name — AGM-88J SiAW • Type — Air-to-surface missile, aimed at targeting anti-access / area denial (A2 / AD) weapons • Origin — United States • Is Missile — y • Service — Planned for 2026 • Used By — To be used by the United States Air Force • Designer — Northrop Grumman • Design Date — Since May 2022 • Manufacturer — Northrop Grumman • Developed From — AGM-88G AARGM-ER • Production Date — Since 2024 • Steering — Tail controlled missile • Launch Platform — * Developed with: F-16 • To be introduced with: F-35A • Planned to be used with: F-15E, F-15EX, F-47, B-21
History
History
In May 2022, the USAF awarded contracts to L3Harris Technologies, Lockheed Martin and Northrop Grumman to begin the first phase of development for the Stand-in Attack Weapon (SiAW). On 28 September 2023, the USAF awarded a 705 million contract to Northrop Grumman to develop and test the SiAW. The SiAW is intended to attack relocatable targets including theater ballistic missile launchers, cruise and anti-ship missile launchers, GPS jamming platforms and anti-satellite systems. It will have a shorter range than standoff weapons, being fired by an aircraft after penetrating enemy airspace. The SiAW will fit inside the F-35 Lightning II's internal weapon bays. The design leverages work on the United States Navy's AGM-88G Advanced Anti-Radiation Guided Missile – Extended Range (AARGM-ER). The USAF plans to have an operational weapon by 2026. In November 2024, Northrop Grumman delivered the first SiAW to the USAF for flight testing.
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- United States
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Cited by Wikipedia
Notes from the source article
These works are cited by the source article, in its own numbering. They are recorded as its citations, not as sources VALÉORINE has verified.
- 1.Tirpak, John A. New SiAW Seen as Modular, Pathfinder Weapon. Air & Space Forces Magazine. 15 June 2022.
- 2.Northrop Grumman. SiAW – Standing-in Attack Weapon. 2020.
- 3.Raytheon AGM-88 HARM. Designation systems.
- 4.Losey, Stephen. US Air Force awards contracts to start designing F-35 weapon. Defense News. 9 June 2022.
- 5.Losey, Stephen. Northrop wins $705 million contract for F-35 air-to-ground weapon. Defense News. 26 September 2023.
- 6.Rosenberg, Zach. Northrop Grumman awarded US Air Force contract to build Stand-in Attack Weapon. Jane's Defence Weekly. 28 September 2023.
- 7.Trevithick, Joseph. First Stand-In Attack Missile Delivered To USAF. The War Zone. 18 November 2024.
- 8.Northrop Grumman. Delivery initiates SiAW flight test program. November 18, 2024.
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Stand-in Attack Weapon was manufactured by Northrop Grumman Corporation. Recorded as a kind of air-to-surface missile. Connected to 1 other published record in the VALÉORINE Encyclopedia.
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