US Army deploys first Golden Dome ALPS surveillance system to track drones over US territory.

The U.S. Army has deployed its first Golden Dome sensor on American soil, marking a shift from concept to real-world homeland defense against drones and low-flying threats. The Army Long-Range Persistent Surveillance (ALPS) strengthens early warning and tracking inside U.S. territory, directly improving the ability to detect and respond to cruise missiles and unmanned systems that can evade traditional radar.

The ALPS system uses passive radio frequency detection to track airborne targets without emitting signals, making it harder to detect or jam while filling gaps against low-altitude threats. Its deployment alongside existing air defense systems shows how the U.S. is building a layered, networked defense architecture that prioritizes survivability, sensor fusion, and faster targeting in future high-threat environments.

Related topic: U.S. Unveils $17.9 Billion Golden Dome Missile Defense Program in 2027 Defense Budget

Instead of transmitting systems such as the MIM-104 Patriot or the Aegis Ballistic Missile Defense, the Army Long-Range Persistent Surveillance (ALPS) system works by exploiting emissions from the target itself to send a track to command systems or interceptors. (Picture source: WAVY TV 10 via X/@lfx160219)

On April 23, 2026, General Michael Guetlein confirmed the deployment of the first operational component of the Golden Dome multi-layer missile defense system on U.S. territory, by identifying the U.S. Army Long-Range Persistent Surveillance (ALPS) system during a conference at Joint Expeditionary Base Little Creek–Fort Story, Virginia. This constitutes the first explicit acknowledgment of a Golden Dome-related system positioned within the U.S. rather than in overseas test environments. The program is directed by Guetlein, who was appointed in 2025 to oversee its execution across ground and space segments.

The Department of Defense maintains a baseline cost estimate of $185 billion for the Golden Dome, while the fiscal year 2027 budget request is projected between $17 and $17.5 billion. The ALPS deployment indicates that at least one subsystem has progressed beyond conceptual design into operational testing under real-world conditions. It also potentially establishes a reference case for assessing the Golden Dome's integration with new sensor architectures and existing air defense systems. No other Golden Dome components have been publicly confirmed as deployed on U.S. soil as of this date. 

According to available information, the Army Long-Range Persistent Surveillance (ALPS) system operates as a passive radio frequency sensing system that does not emit signals, relying instead on interception and processing of electromagnetic emissions from external sources such as communications, navigation, and radar reflections associated with airborne targets. The ALPS is said to detect cruise missiles, fixed-wing aircraft, rotary-wing aircraft, and unmanned aerial systems, with a focus on low-altitude and low-observable targets that present challenges for conventional radar coverage. Its operating principle is consistent with passive coherent location systems, where multiple receivers process signal reflections to generate tracks without active transmission.

The deployed configuration is said to correspond to an Increment 2 mounted on Family of Medium Tactical Vehicles, providing the ability to reposition sensors across different sites. The ALPS system remains in a prototype phase and has not transitioned into a formal program of record within the U.S. acquisition framework. No numerical data has been released regarding detection range, number of simultaneous tracks, or angular resolution. Industrial attribution links the system to PAE through references to its fire-related development activities. Within the Golden Dome architecture, the ALPS contributes to the sensor layer, generating detection and tracking data that feeds into command-and-control networks responsible for assigning engagement tasks to interceptor systems.

Therefore, the ALPS system improves the engagement chain by providing early warning and tracking data that can be used to cue interceptors. At Fort Story, ALPS is deployed in proximity to a THAAD air defense system, possibly indicating a system addressing detection gaps associated with low-altitude cruise missiles and small unmanned systems, which can exploit terrain masking and reduced radar cross-section. There is no confirmed evidence of integration with space-based sensors or national-level missile warning networks at this stage. The current configuration may reflect a focus on regional air defense enhancement rather than strategic missile tracking, and this indicates that terrestrial sensor deployment is advancing ahead of space-based elements. 

The installation at Fort Story is located in a coastal zone near Norfolk, an area with high volumes of civilian and military air traffic, providing a dense electromagnetic environment for system evaluation. The physical layout consists of a low-visibility configuration of poles and wire elements arranged in a triangular geometry, designed to support passive signal collection without generating detectable emissions. The system is therefore actively collecting airspace data under operational conditions, rather than controlled test scenarios, allowing evaluation against real traffic patterns. This deployment represents the first confirmed use of ALPS on U.S. soil, although earlier deployments are said to have occurred abroad in locations that have not been specified.

Co-location with operational air defense systems enables direct correlation between passive tracks and radar-based tracks. No Initial Operational Capability date has been defined, indicating that the system remains in an evaluation phase. Current activity might therefore focus on validating detection consistency, track accuracy, and data fusion performance within a broader network. The ALPS is one of several systems present at the Fort Story site, although additional components have not been publicly identified, forming part of a layered and multi-domain architecture associated with Golden Dome.

The architecture combines ground-based sensors and interceptors with planned space-based sensors and interceptors, supported by a command-and-control network designed to process data inputs in near real time using AI-assisted tools. The supporting digital infrastructure includes the Apex Arc data lake, which aggregates sensor data into a shared environment for analysis and dissemination. An AI sandbox environment is used to develop and test algorithms for detection, tracking, and engagement support functions. In April 2026, an ecosystem hub was established to coordinate participation from industry, academic institutions, government agencies, and allied partners. This structure is intended to accelerate development cycles and integration across multiple system components.

The combination of physical deployment and digital infrastructure indicates a dual-track development model. The Golden Dome program is designed as a layered missile defense system intended to protect the continental United States against ballistic missiles, hypersonic glide vehicles, and cruise missiles. The architecture includes space-based sensors for early warning and tracking, ground-based systems such as ALPS, and interceptors deployed across land and maritime domains, with additional interceptor concepts under development for space deployment. A central operational concept is the emphasis on boost-phase intercept, targeting missiles shortly after launch rather than during midcourse flight.

Achieving this requires a constellation of thousands of satellites in low Earth orbit to maintain continuous coverage and tracking capability. Command and control is structured around an AI-enabled network linking sensors to interceptors with minimal delay. Orbital positioning constraints limit the availability of space-based interceptors at any given time, creating coverage gaps that require additional satellites to mitigate. These factors directly influence system scale and cost. The program was initiated by executive order on January 27, 2025, and renamed from Iron Dome for America to Golden Dome in May 2025, with leadership under Michael Guetlein confirmed in July 2025.

As of April 2026, the program has reached the stage of initial domestic deployment of a ground-based sensor while continuing development across other elements. Industrial participation includes more than 1,000 qualified bidders identified in late 2025, indicating a broad contractor base. In April 2026, Other Transaction Authority agreements were used to support prototype development for space-based interceptors. Initial operational elements are projected for deployment around 2028, although a complete architecture timeline has not been defined.

The program is advancing through parallel tracks that combine field testing with ongoing research and development. This reflects the complexity of integrating multiple layers into a single operational system. Cost projections for Golden Dome vary depending on assumptions regarding system scale and architecture, with the Pentagon baseline at $185 billion, while Congressional Budget Office estimates reach up to $831 billion and external projections extend into multi-trillion-dollar ranges. Major cost drivers include the number of satellites required for persistent coverage, the replacement cycle associated with low Earth orbit decay, and the production and deployment of interceptors across multiple domains.

Operational modeling indicates that defending against even limited missile salvos requires a proportional increase in satellite numbers, increasing both cost and system complexity. The current focus on ground-based sensing systems such as ALPS indicates prioritization of near-term threats from cruise missiles and unmanned systems. The space-based interceptor layer has not yet been deployed and remains subject to cost and feasibility constraints. Funding structures rely in part on non-base budget mechanisms, which introduce uncertainty in long-term financing. No integrated end-to-end missile defense capability has been demonstrated across all planned layers at this stage.

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.