IRIA News

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Lockheed Martin has been awarded a $233 million firm-fixed-price contract to deliver IRST21 Block II systems and initial spares to the U.S. Navy and Air National Guard.

The contract marks a significant step in the deployment of next-generation infrared search and track (IRST) capabilities across multiple platforms, aimed at improving situational awareness and threat response for U.S. forces.

IRST21 is a long-wave infrared sensor designed to detect and track airborne targets passively at extended ranges. By providing longer detection distances and faster target information, the system reduces decision-making time for pilots and enhances operational readiness.

The Block II variant, contracted under this award, features upgraded optics, advanced processors, and industry-leading algorithms that significantly improve threat-detection range while providing critical tracking and targeting data to support beyond-visual-range missile engagements.

The system operates passively, meaning it does not emit signals, making it more resistant to electronic jamming and less detectable by adversaries. This feature is particularly valuable in high-threat environments where radar emissions may reveal aircraft positions or attract enemy fire. Analysts say such capabilities are becoming increasingly important as global adversaries develop advanced stealth and electronic warfare technologies.

Strategic and Operational Significance

The award follows the U.S. Navy’s declaration of Initial Operational Capability for IRST21, which cleared the path for full-rate production of the Block II variant. Experts describe the system as a major enhancement to U.S. air combat capability, allowing aircraft to operate effectively even in radar-denied environments.

IRST21 program director for Lockheed Martin, Cristin Stengel said, “IRST21 Block II delivers a game-changing leap in passive warfighting capabilities across multiple platforms.”

“By significantly enhancing the range and accuracy to enable weapon employment in challenging environments, this system ensures pilots remain ahead of evolving adversaries and mission-ready at all times,” Stengel added.

Platform Integration and Capabilities

On the F/A-18E/F Super Hornet, IRST21 is mounted on the nose of the centerline fuel tank, complementing the aircraft’s AN/APG-79 radar. This combination allows the Super Hornet to maintain operational effectiveness in radar-denied or high electronic attack environments.

For F-15 and F-16 aircraft, the system is embedded in a modular, externally mounted Legion Pod, allowing for rapid deployment and ease of transport. This integration brings sixth-generation targeting capabilities to fourth-generation aircraft, extending the operational lifespan and effectiveness of older platforms.

Beyond its detection capabilities, IRST21 provides pilots with high-fidelity target tracking data that can be integrated with existing weapon systems. The system’s long-range detection allows for faster engagement decisions and improved threat prioritization, a crucial advantage in modern air combat where split-second decisions can determine mission success.

Broader Modernization Efforts

The deployment of IRST21 Block II reflects the U.S. military’s broader efforts to modernize legacy aircraft while countering evolving global threats. Passive detection systems like IRST21 are seen as critical for maintaining an edge against adversaries equipped with stealth aircraft or advanced electronic warfare systems. By allowing aircraft to detect and track threats without revealing their own positions, the system enhances survivability and operational flexibility.

Experts note that the system’s capabilities will not only benefit U.S. Navy and Air National Guard operations but could also influence allied air forces in joint operations. As air combat strategies evolve, integrating advanced passive sensors with traditional radar systems is increasingly viewed as a necessary step to maintain air superiority.

As the U.S. military continues to face a dynamic range of aerial threats, technologies like IRST21 Block II are expected to play an essential role in sustaining operational readiness and technological advantage. Full-rate production and fleet deployment of the Block II variant will expand the number of aircraft equipped with this capability, providing broader coverage and a stronger deterrent posture in contested airspaces.

By equipping aircraft with systems capable of passive detection and enhanced targeting, the U.S. armed forces aim to maintain decisive superiority over adversaries in both traditional and electronically contested battlefields.

Analysts suggest that such upgrades are part of a wider trend in modernizing air capabilities, blending legacy platforms with cutting-edge technologies to ensure readiness for the challenges of 21st-century warfare.