US Air Force Confirms F-47 Sixth-Generation Fighter Will Deploy SiAW Stand-In Attack Weapon

F-47 Sixth-Generation Fighter Will Deploy SiAW Stand-In Attack Weapon

The F-47 sixth-generation fighter will deploy the SiAW stand-in attack weapon, marking one of the first confirmed weapon integrations for the U.S. Air Force’s future Next Generation Air Dominance (NGAD) aircraft.

A recently released U.S. Air Force acquisition notice identified the F-47 among platforms planned to carry the Stand-in Attack Weapon (SiAW), alongside aircraft such as the F-35, F-16, and the B-21 stealth bomber.

The development highlights how the U.S. Air Force intends to pair advanced stealth aircraft with new precision strike weapons designed to penetrate heavily defended airspace.

The Big Picture

The Next Generation Air Dominance (NGAD) program represents the centerpiece of U.S. air superiority strategy for the coming decades. The F-47 fighter, the crewed element of the NGAD system-of-systems, will operate alongside autonomous drones, advanced sensors, and networked weapons.

Modern adversaries such as China and Russia have invested heavily in layered air defense systems, long-range radar networks, and mobile missile launchers. These systems form what military planners describe as Anti-Access/Area Denial (A2/AD) environments.

Traditional stand-off weapons launched from long distances can be detected or intercepted by such defenses. The U.S. Air Force is therefore developing weapons that can be launched by stealth aircraft operating closer to hostile targets.

The SiAW stand-in attack weapon fits directly into this concept.

What’s Happening

The Stand-in Attack Weapon (SiAW) is a next-generation air-to-surface missile currently under development by Northrop Grumman for the U.S. Air Force.

The Air Force awarded Northrop Grumman a $705 million contract in September 2023 to develop and test the system under a rapid prototyping program.

SiAW builds on technologies developed for the AGM-88G AARGM-ER anti-radiation missile but expands its mission set beyond radar suppression. The weapon is designed to strike:

• Theater ballistic missile launchers
• Land-attack and anti-ship cruise missile launchers
• Integrated air defense nodes
• Electronic warfare systems
• GPS jamming platforms
• Anti-satellite systems

These targets are often mobile and difficult to destroy using traditional strike weapons.

Early testing of the missile has already begun. In December 2025, an F-16 Fighting Falcon conducted a separation test at Eglin Air Force Base, validating the missile’s safe release from an aircraft during flight.

Initial operational capability is expected around 2026, while the first production lot may arrive around 2030 depending on program progress.

Why It Matters

The integration of the SiAW stand-in attack weapon with the F-47 sixth-generation fighter reveals how the Air Force intends to fight inside heavily defended battlespaces.

Unlike long-range cruise missiles launched from outside enemy air defenses, stand-in weapons are deployed by stealth aircraft after they penetrate hostile territory. This approach provides several operational advantages.

First, it reduces warning time for enemy defenses. A stealth aircraft operating inside contested airspace can release weapons at closer distances, making interception more difficult.

Second, the weapon’s advanced sensors and guidance allow it to target mobile threats that may relocate after launch. These targets include road-mobile missile launchers or electronic warfare systems that shift positions to avoid detection.

Finally, the missile supports multi-domain warfare by allowing aircraft to attack targets that support space and cyber operations, such as anti-satellite systems or GPS jammers.

Together, these capabilities strengthen the U.S. Air Force’s ability to disrupt an adversary’s integrated defense network early in a conflict.

Strategic Implications

The F-47 SiAW stand-in attack weapon combination represents a significant step toward maintaining U.S. air superiority against peer competitors.

China’s People’s Liberation Army has invested heavily in long-range surface-to-air missile systems, over-the-horizon radar, and mobile missile units designed to threaten U.S. forces operating in the Indo-Pacific.

Russia maintains similar layered air defense systems built around platforms such as the S-400 and S-500, combined with electronic warfare capabilities.

In both cases, mobile missile launchers and electronic warfare nodes form the backbone of their defensive networks.

Weapons such as SiAW are designed to dismantle those networks by targeting critical nodes quickly and precisely. By enabling stealth aircraft like the F-47 to attack these systems directly, the United States can create corridors for follow-on strikes by other aircraft and long-range weapons.

This strategy mirrors earlier suppression of enemy air defense (SEAD) concepts but adapts them for highly contested environments.

Competitor View

Adversaries will likely view the F-47 and SiAW combination as part of a broader U.S. strategy to neutralize advanced air defense systems.

China, in particular, has prioritized the development of anti-access strategies aimed at limiting U.S. operations in the Western Pacific. Mobile missile systems and electronic warfare platforms play a major role in that strategy.

A weapon capable of rapidly locating and destroying those systems threatens the survivability of such networks.

Russia may interpret the program similarly. Its doctrine relies heavily on layered air defense and mobile missile units to protect strategic assets and operational forces.

As a result, both countries are likely to invest further in countermeasures such as electronic warfare, decoys, and dispersed missile operations to complicate targeting.

What To Watch Next

Several key milestones will determine the future trajectory of the SiAW stand-in attack weapon program.

The next major step will be additional flight tests involving powered missiles and guidance systems. These tests will validate the missile’s navigation, seeker performance, and electronic resilience.

Integration with stealth platforms such as the F-35 and future aircraft like the F-47 will also require extensive testing to ensure safe internal carriage and release.

Production planning will follow once the rapid prototyping phase concludes. The Air Force has signaled a requirement for up to 600 missiles per year, with a planned service life of around 15 years.

These milestones will determine how quickly the weapon becomes part of the operational arsenal.

Capability Gap

The SiAW stand-in attack weapon addresses a growing operational challenge for modern air forces.

Many high-value military systems today are mobile, networked, and protected by advanced electronic warfare capabilities. Traditional guided bombs and older anti-radiation missiles often struggle to track these targets once they relocate or shut down their radar emissions.

SiAW aims to close that gap through multi-mode targeting, anti-jam navigation, and the ability to strike rapidly relocating systems.

However, the weapon also faces practical limitations. Penetrating contested airspace still requires stealth aircraft capable of surviving advanced air defense systems. Without platforms such as the F-35 or F-47, the missile’s operational value would be reduced.

This dependency highlights the importance of integrating new weapons with next-generation aircraft.

The Bottom Line

The F-47 sixth-generation fighter armed with the SiAW stand-in attack weapon reflects the U.S. Air Force’s strategy to defeat advanced air defenses and maintain air dominance in future high-end conflicts.