ASELSAN has completed the modernisation of NATO’s Very Low Frequency Over the Air Monitoring (VLF OTAM) equipment for Allied Maritime Command ahead of the planned schedule, bringing the upgraded system into service after installation, verification, acceptance testing and user training.
The project was delivered under a contract signed between ASELSAN and the NATO Communications and Information Agency on 22 September 2025. NCIA described it at signing as its first contract with ASELSAN and said the upgraded hardware would strengthen Allied Maritime Command’s maritime situational awareness. The 28 August 2026 completion announcement confirms that ASELSAN-developed VLF systems have now been integrated into NATO’s OTAM infrastructure.
Key Facts
- Project: Upgrade and Refresh of Very Low Frequency Over the Air Monitoring Equipment
- Customer: NATO Communications and Information Agency
- Operational user: Allied Maritime Command
- Supplier: ASELSAN
- Contract signed: 22 September 2025
- Completion announced: 28 August 2026
- Status: Installed, verified, accepted and in service
- Schedule: Completed ahead of plan
- Contract value: Not publicly disclosed
The New Milestone Is Operational Acceptance
The August 2026 development is not the signing of a new NATO contract. NCIA publicly announced the agreement in September 2025 during Turkish Industry Day in Ankara.
The new milestone is completion of the project and operational introduction of the upgraded monitoring infrastructure. TRT Haber and Anadolu Agency report that ASELSAN completed installation, system verification, acceptance tests and user training before the planned schedule.
NCIA Identified ASELSAN as a New NATO Supplier in 2025
NCIA announced the contract after Turkish Industry Day on 22 September 2025, describing it as the agency’s first contract with ASELSAN. NCIA explicitly linked the upgraded hardware to Allied Maritime Command and said it would enhance MARCOM’s maritime situational awareness.
VLF Occupies the 3–30 kHz Spectrum
Very Low Frequency is the internationally defined radio-frequency band from 3 to 30 kHz. The project described publicly is specifically an Over the Air Monitoring modernisation effort, used to monitor NATO VLF broadcasts.
The programme should therefore not be described as ASELSAN supplying NATO with a complete new VLF transmitter network, submarine communications network or strategic command system unless NATO or ASELSAN separately confirms those functions.
OTAM Is a Monitoring Capability
Over-the-air monitoring allows an organisation to assess radio transmissions from the receiving side rather than relying only on internal transmitter status information. That can support confirmation that a signal is actually being transmitted through the electromagnetic environment and can help identify availability or performance problems.
The public NATO and Turkish reporting does not disclose the exact monitoring parameters, station locations, sensor quantity, processing architecture or network topology.
Why VLF Matters in the Maritime Domain
VLF has long-standing relevance to naval communications because lower-frequency radio signals have propagation characteristics suited to specialised long-range maritime applications. For NATO, monitoring the performance and availability of VLF broadcasts contributes to the resilience of a communications layer used in the maritime environment.
Installation and Acceptance Are as Important as Hardware Delivery
The completed scope included installation, verification, acceptance testing and user training. These stages demonstrate that the system progressed through the full NATO delivery and operational-acceptance chain rather than stopping at equipment manufacture.
Exact System Configuration Remains Undisclosed
Neither NATO nor the Turkish reports reviewed for this article disclose the number of monitoring sites, receiver count, antenna configuration, processing hardware, software architecture or geographic deployment. The contract value is also not public.
No public source identifies the precise detection sensitivity, signal-processing performance, frequency-channel capacity or availability requirement achieved by the modernised system.
A NATO Reference for ASELSAN’s Communications Business
For ASELSAN, the project has significance beyond the immediate hardware delivery. Successfully completing a first direct NCIA contract provides a technical and institutional reference for future Alliance competitions.
Future contracts should not be assumed, however. Each NATO procurement remains subject to its own technical, security, commercial and eligibility requirements.
The Timing Aligns With ASELSAN’s International Growth
The VLF milestone comes as ASELSAN is expanding both its international order book and its naval technology portfolio. The company reported an order backlog of $23.2 billion at the end of the first half of 2026, up 45% year on year, while new contracts reached $4.9 billion.
The NATO project is smaller in public visibility than major platform programmes, but it is strategically useful because it demonstrates direct delivery into an Alliance command-and-information infrastructure.
Limitations and Counterpoint
The contract value, number and location of systems and detailed technical specifications have not been disclosed.
The project is a VLF OTAM modernisation effort. It should not be described as a complete NATO VLF communications replacement programme. The term “VLF communications systems” used in Turkish reporting is broader than the formal contract title, which specifically concerns over-the-air monitoring equipment.
Implications / Next
The next development to watch is whether NCIA publishes a formal completion notice with additional information on system performance, deployment or follow-on support.
A second indicator is whether ASELSAN receives further direct NCIA contracts after successfully completing its first agreement with the agency.
Conclusion
ASELSAN’s NATO VLF milestone is fundamentally a delivery and acceptance story. The company has completed the upgrade of Allied Maritime Command’s VLF over-the-air monitoring equipment ahead of schedule, including installation, verification, acceptance tests and user training.
The programme began with NCIA’s first contract with ASELSAN in September 2025 and has now moved into operational service. Its significance lies in the technical and institutional reference it creates inside NATO’s communications infrastructure ecosystem.
