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US to spend $1B on electronic warfare upgrade for F-35s
Lockheed Martin will carry out the upgrade

US to spend $1B on electronic warfare upgrade for F-35s

May 17, 2026
02:09 pm

What's the story

The United States has announced a nearly $1 billion upgrade program for its fifth-generation stealth fighter, the F-35 Lightning II. The initiative focuses on modernizing electronic warfare systems and enhancing combat capabilities across hundreds of aircraft operated by the US military and foreign operators of the Joint Strike Fighter (JSF). Lockheed Martin has been awarded a contract worth $991.1 million to produce and deliver 432 modification kits for these jets.

Delivery

Upgrade kits to be delivered to multiple military branches

The contract from the US Department of War (DoW) includes delivery of upgrade kits to several military branches. These include 97 aircraft for the US Air Force, 54 for the US Marine Corps, and 42 for the US Navy. The order also covers 106 jets under Foreign Military Sales and another 133 aircraft from non-US partner nations participating in this modernization program.

Modernization details

Upgrades part of evolving Block 4 modernization package

The upgrades are part of the F-35's evolving Block 4 modernization package, which Lockheed Martin describes as the "most significant evolution of F-35 capabilities to date." The company said this package includes over 70 major upgrades for all three F-35 variants. These include increased missile capacity, advanced electronic warfare capabilities, improved target recognition among other classified features.

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System enhancement

AN/ASQ-239 EWS likely to be enhanced through these kits

The F-35 currently uses the AN/ASQ-239 electronic warfare suite (EWS) developed by BAE Systems. The modernization kits are likely to enhance the capabilities of this existing system, which offers radar warning, electronic attack, targeting support, and countermeasure capabilities through a fully integrated architecture. BAE Systems describes the AN/ASQ-239 as "the world's most advanced, fully integrated electronic warfare (EW) and countermeasures technology."

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System capabilities

EWS provides advanced situational awareness capabilities

The AN/ASQ-239 system provides "360-degree situational awareness" and helps pilots "identify, monitor, analyze, and respond to threats" while operating in signal-dense environments. BAE Systems states that the suite delivers "radio frequency and infrared countermeasures and rapid response capabilities like no other aircraft." This electronic warfare modernization push comes amid reports of F-35 fighter jets operating around the Strait of Hormuz squawking transponder code 7700.

Operational challenges

One of the world's most advanced fighters

The F-35 Lightning II is one of the most advanced and expensive fighter aircraft in the world, costing over $100 million (depending on variant). The stealth fighter is used or being inducted by over 19 countries. However, it has faced operational challenges in the region. Iranian state media reported an advanced air-defense system used by the Islamic Revolutionary Guard Corps (IRGC) had struck and downed a US F-35 over central Iran earlier this year.

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