US Air Force awards $40 Million contract to rebuild aging Arctic radar line across Northern Canada.

The U.S. Air Force has awarded a $40 million contract to rebuild aging Arctic radar infrastructure across northern Canada, extending the operational life of NORAD’s North Warning System as concerns grow over cruise missile and polar-route threats approaching North America. Announced on May 19, 2026, the program will replace deteriorating AN/FPS-124 radomes that protect unattended low-altitude surveillance radars, preserving continuous early-warning coverage across remote Arctic corridors while next-generation over-the-horizon systems remain years from full deployment.

The sustainment effort focuses on restoring the survivability and reliability of fixed radar sites exposed to more than three decades of extreme Arctic weather, including icing, corrosion, and severe wind loading. Designed specifically to detect low-flying aircraft and cruise missiles beneath long-range radar coverage, the AN/FPS-124 network remains a critical gap-filler architecture for NORAD as the United States and Canada transition toward future distributed and space-based northern sensing systems.

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The North Warning System is a joint United States and Canadian network of 15 long-range and 36 to 39 short-range radar stations stretching across the Arctic to detect incoming Russian aircraft and missiles approaching North America. (Picture source: Nasittuq)

On May 19, 2026, the U.S. Air Force awarded IAP World Services of Melbourne, Florida, a $40 million indefinite-delivery/indefinite-quantity (IDIQ) contract for the replacement of AN/FPS-124 radomes supporting the Atmospheric Early Warning System across northern Canada through May 20, 2035. Managed by the Air Force Life Cycle Management Center’s Homeland Surveillance Branch at Hill Air Force Base, the effort covers production, transportation, installation, removal, and disposal of 28-foot composite radome assemblies protecting unattended AN/FPS-124 short-range radars within the North Warning System.

The radar chain, jointly operated by the United States and Canada through NORAD, consists of roughly 36 to 39 short-range sites positioned between AN/FPS-117 long-range radars across Alaska, Yukon, the Northwest Territories, Nunavut, and Labrador. Most radomes entered service between 1990 and 1992 during the replacement of the DEW Line (Distant Early Warning Line), leaving key structures exposed to more than three decades of Arctic wind loading, icing, ultraviolet degradation, thermal cycling, and corrosion. Continued investment in radome replacement rather than radar retirement indicates NORAD still considers fixed Arctic radar infrastructure necessary while over-the-horizon and distributed surveillance systems remain under development. 

The procurement process began on May 27, 2025, through a presolicitation notice for the AN/FPS-124 Radome Replacement Program outlining a five-year IDIQ contract with a two-year extension option, while projected execution timelines extended to nine years once installation sequencing was included. The formal request for proposals was issued on August 5, 2025, with four bidders participating and proposals due during September 2025. Initial acquisition planning projected a ceiling value of $21.744 million before the final award increased to $40 million, reflecting the logistical complexity of sustaining such remote Arctic infrastructure.

The U.S. Air Force combined fixed-price and cost-reimbursement structures because transportation schedules, weather disruptions, aircraft availability, and site accessibility remain difficult to predict across northern Canada. Fiscal 2025 and Fiscal 2026 obligations totaled $4.576 million at award, indicating incremental execution through future task orders rather than immediate replacement of the entire radar network. September 2025 amendments also modified installation provisions covering weather-delay handling and restricted access to controlled engineering data through the Joint Certification Program. 

For the U.S., the AN/FPS-124 network provides persistent low-altitude surveillance coverage across the Arctic approaches linking Russia and North America. The polar corridor remains the shortest route between Russian strategic aviation bases and major North American military and industrial centers, preserving the operational relevance of northern radar coverage after the Cold War. The larger AN/FPS-117 radars provide wide-area surveillance but remain constrained against low-altitude targets by radar horizon limitations and terrain masking, leading to deployment of the AN/FPS-124 as a dedicated gap-filler architecture focused on cruise missiles and aircraft operating below long-range radar coverage envelopes.

Unlike airborne surveillance operations dependent on sortie generation and tanker support, the NWS unattended radar chain provides uninterrupted persistence through autonomous operation and remote command links. Radar data is processed locally before its transmission through satellite communications into NORAD command systems connected to Regional Operations Control Centers at Elmendorf Air Force Base and CFB North Bay. The current sustainment effort indicates NORAD assesses fixed Arctic radar coverage as operationally necessary during the transition toward future northern sensing architectures.

The AN/FPS-124 was engineered during the late Cold War specifically for unattended Arctic operation and low-altitude target detection. The radar operates within the 1218-1398 MHz band using six selectable frequencies and provides 360-degree surveillance coverage from roughly 3.2 km to 113 km. This Doppler radar was optimized for detecting small radar cross-section targets flying beneath long-range radar coverage zones, particularly cruise missiles approaching through polar routes. Signal processing architecture incorporated pulse compression, sixteen Doppler filters, adaptive clutter normalization, clutter cancellation, zero-Doppler detection, and Kalman-filter-based target tracking capable of processing roughly 200 credible tracks every six seconds.

Arctic clutter caused by migratory birds, sea ice, and environmental reflections had degraded earlier DEW Line systems, making advanced filtering functions a central design requirement. The electronically scanned stripline antenna array eliminated conventional rotating assemblies, more vulnerable to Arctic wear, while operational testing demonstrated mean times between failures exceeding 4,000 hours and availability approaching 99.83%. The contract targets the replacement of composite radomes protecting radar antenna arrays and associated electronics after more than thirty years of Arctic exposure.

Existing radomes installed between 1990 and 1992 experienced sustained wind loading, freeze-thaw cycles, ultraviolet degradation, sea salt corrosion, and repeated icing conditions across exposed northern coastal regions. U.S. Air Force planning, therefore, required complete disassembly and disposal of existing structures rather than localized refurbishment, indicating broad structural fatigue affecting multiple installations. The sustainment package also includes transportation support, technical data deliverables, spare parts procurement, contractor travel, and development of installation and maintenance training material for remote Arctic operations.

Separate activity pursued replacement of SCR-T28D zenith panels integrating OSHA 1910.140-compliant fall-arrest anchor systems while retaining lightning rods, acrylic domes, photocell systems, and existing antenna interfaces. One replacement composite radome assembly carried a Defense Logistics Agency standard unit price approaching $179,760. The North Warning System (NWS) currently consists of fifteen AN/FPS-117 long-range radar sites and roughly 36 to 39 AN/FPS-124 short-range installations distributed across Alaska and northern Canada.

Operational locations include Hall Beach, Dewar Lakes, Cambridge Bay, Shepherd Bay, Cape Dyer, Brevoort Island, Saglek, Cartwright, Resolution Island, and Rowley Island, with multiple sites accessible only through helicopter lift or seasonal air transport. Most short-range installations operate without permanent personnel and instead rely on autonomous power systems, satellite communications, remote diagnostics, emergency shelters, and periodic contractor visits. Many radar locations occupy or adjoin former DEW Line facilities originally constructed during the 1950s for Soviet bomber warning missions.

Several Alaska sites, including Wainwright, Point Lonely, and Flaxman Island, were later closed because coastal erosion and sustainment costs exceeded operational value. The transition from the DEW Line to the North Warning System also shifted operational emphasis from high-altitude bomber detection toward persistent low-altitude cruise missile surveillance across the Arctic approaches. Industrial support for the AN/FPS-124 began in October 1990 when Unisys received contracts exceeding $326 million covering the acquisition of 37 unattended radar systems, remote radar controllers, ancillary equipment, and associated software.

The broader modernization effort emerged from the March 1985 U.S.-Canada North American Air Defence Modernization agreement, replacing aging DEW Line infrastructure with radar systems optimized for low-altitude threat detection. AN/FPS-117 deployment concluded first during the late 1980s, while engineering and integration delays affecting the AN/FPS-124 postponed full-rate production until 1991 despite earlier cruise missile-target testing. Final deployment and integration continued through late 1994, after which sustainment shifted toward infrastructure reliability and life-cycle management.

Current responsibility remains with AFLCMC’s Homeland Surveillance Branch at Hill Air Force Base, where procurement activity focuses primarily on preserving infrastructure survivability rather than replacing radar electronics. Arctic sustainment costs continue to be driven heavily by transportation requirements, aviation support, seasonal access windows, environmental exposure, fuel logistics, and the limited contractor base capable of operating in remote northern regions. Although the AN/FPS-124 continues providing persistent Arctic surveillance coverage, the radar remains a fixed-site line-of-sight architecture designed during the late Cold War.

Therefore, the AN/FPS-124 faces limitations against emerging aerial threats. Detection performance declines against terrain-following targets operating beneath radar horizon constraints, while the system was not engineered for hypersonic glide vehicle tracking or advanced multi-domain sensor-fusion architectures. Nevertheless, fixed Arctic radar infrastructure still provides continuous coverage that cannot currently be replicated through intermittent airborne patrols or space-based systems alone across remote northern corridors.

The radome replacement effort, therefore, functions as a bridging sustainment strategy extending operational viability of the existing network without immediate radar replacement. Parallel modernization initiatives increasingly focus on over-the-horizon radar, distributed sensor networks, and expanded space-based tracking capabilities intended to improve warning time against advanced cruise missiles and hypersonic glide vehicle threats approaching through polar routes. Sustainment timelines extending through May 2035 indicate NORAD expects continued operational reliance on the AN/FPS-124 network throughout the transition toward future Arctic surveillance architectures.

Written by Jérôme Brahy

Jérôme Brahy is a defense analyst and documentalist at Army Recognition. He specializes in naval modernization, aviation, drones, armored vehicles, and artillery, with a focus on strategic developments in the United States, China, Ukraine, Russia, Türkiye, and Belgium. His analyses go beyond the facts, providing context, identifying key actors, and explaining why defense news matters on a global scale.