Soldiers transmit encrypted images and video from the field in real time
For the first time in a live NATO operation, Spain is deploying a functioning 5G military network at its base in Lešť, Slovakia — where it leads the alliance's largest multinational battlegroup. The €3 million experiment asks a question that no army has yet answered in the field: whether next-generation connectivity can hold together the many simultaneous threads of modern warfare. If it succeeds, the lessons drawn from 800 soldiers and 200 vehicles on Europe's eastern flank may quietly rewrite how allied forces communicate for a generation.
- Modern warfare now unfolds across six domains at once — land, sea, air, space, cyber, and cognitive — and existing military communications were never built to carry that load in real time.
- Spain is staking its largest international deployment ever as the live test bed, exposing the experiment to real electromagnetic interference, damaged infrastructure, and the friction of multinational command.
- Two ruggedized 5G nodes in transportable containers, 60 rugged smartphones, augmented reality glasses, and AI translation tools are being fielded together for the first time in an active operational environment.
- The network runs isolated from the internet, with AI capable of translating between Spanish, Slovak, Slovenian, Portuguese, and Czech forces on the fly — collapsing the language barrier that has long slowed allied coordination.
- Every lesson learned here feeds directly into NATO's future tactical communications doctrine, meaning the outcome in a Slovak training base could set interoperability standards across the entire alliance.
Spain's Defense Ministry is preparing to do something no military has done before in a live operational setting: run a 5G network inside an active NATO deployment. The site is Lešť, Slovakia, where roughly 800 Spanish troops and more than 200 vehicles have been stationed since 2024 as part of the alliance's eastern flank presence. Spain leads the multinational battlegroup there — its largest international military deployment to date — and that force will now serve as the laboratory for a technology that could fundamentally change how modern armies coordinate.
The project, backed by Spain's Joint Cyber Command, responds to a structural shift in warfare. Operations no longer unfold in a single domain; land, sea, air, space, cyber, and cognitive actions happen simultaneously and must communicate with each other instantly. A 5G network can carry that volume of data with low latency and support hundreds of connected devices at once. The Spanish military wants to know whether it holds up under real field conditions — electromagnetic interference, degraded infrastructure, and the complexity of multinational command.
At the heart of the deployment are two transportable 5G nodes built into ruggedized containers, supported by base stations, antennas, and broadband radio links. Soldiers will carry 60 rugged 5G smartphones and 20 reinforced tablets. Commanders will work with a large immersive touchscreen, augmented reality glasses, and a hundred autonomous beacons tracking personnel and vehicles in real time. The entire network runs isolated from the internet, protected against external intrusion.
The software layer is equally ambitious. Artificial intelligence tools running on local servers will translate conversations between the Spanish, Slovak, Slovenian, Portuguese, and Czech forces in real time, transcribe meetings, and generate reports automatically. The system will also integrate with unmanned platforms and process high-definition aerial video feeds.
The total investment is €3 million — €1.9 million for equipment and €600,000 for engineering, installation, and training. The two 5G nodes alone account for €1.2 million. Secure messaging runs through applications certified by Spain's National Cryptological Center. The fundamental question the deployment is designed to answer is whether 5G genuinely improves multinational coordination in real operations — and the answer, whatever it turns out to be, will shape NATO's tactical communications doctrine for years ahead.
Spain's Defense Ministry is about to conduct an experiment that has never been attempted before in a live military setting: running a 5G network in the middle of an active NATO operation. The test site will be established at the Spanish-led multinational base in Lešť, Slovakia, where roughly 800 Spanish troops and more than 200 vehicles have been stationed since 2024 as part of the alliance's eastern flank presence. This is Spain's largest international military deployment to date, and now it will serve as the laboratory for a communications technology that could reshape how modern armies coordinate across vast distances and multiple domains of warfare.
The project, backed by Spain's Joint Cyber Command, responds to a fundamental shift in how contemporary military operations work. Modern warfare no longer happens in a single domain—land, sea, air, space, cyber, and cognitive operations now happen simultaneously, and they need to talk to each other in real time. A 5G network can handle the volume of data that creates, with lower delays and the ability to connect hundreds of devices at once. The Spanish military wants to see whether this technology can actually work in the field, under real conditions, where electromagnetic interference and damaged infrastructure are real problems. The goal is a resilient, secure communications backbone that keeps commanders connected even when conventional networks fail.
The deployment will center on two transportable 5G nodes, each built into ruggedized containers designed to be moved quickly wherever needed. These will form the core of the network, supported by base stations, antennas, and broadband radio links to reach areas without fiber optic cable. The system will include 60 rugged smartphones and 20 reinforced tablets compatible with 5G, along with a suite of command-and-control tools: a large immersive touchscreen display, augmented reality glasses for decision-making, and a hundred autonomous beacons to track personnel and vehicles in real time. Soldiers in the field will be able to send encrypted images, video, and data back to command posts instantly. The network will operate independently from the internet, isolated and protected against external threats.
What makes this deployment particularly ambitious is the software layer. The system will include artificial intelligence tools running on local servers, capable of translating conversations between multinational forces in real time, transcribing meetings, and automatically generating reports. It will integrate with unmanned systems and handle high-definition video feeds from aerial platforms. All of this is designed to give commanders a constantly updated tactical picture of what's happening on the ground, shared across the Spanish, Slovak, Slovenian, Portuguese, and Czech forces that make up the multinational battlegroup.
The total investment is three million euros. Of that, 1.9 million goes to equipment and systems, while nearly 600,000 euros covers engineering, installation, configuration, and training. The two transportable 5G nodes alone cost 1.2 million euros. Secure communications will run through tactical messaging applications certified by Spain's National Cryptological Center, with licenses and support guaranteed for two years. The network is built to answer a specific question: can 5G actually improve how multinational forces coordinate in real operations, or does it remain a theoretical advantage? The lessons learned here will shape NATO's tactical communications doctrine for years to come.
Citas Notables
The Joint Cyber Command believes operating these capabilities in a real environment will enable rapid and secure information exchange between national systems, advanced C5ISR applications, improved interoperability, and resilient, low-latency command and control in a multinational setting.— Spain's Joint Cyber Command
La Conversación del Hearth Otra perspectiva de la historia
Why does Spain need to test 5G in Slovakia specifically? Why not in a lab or a training exercise?
Because a lab can't replicate what actually happens in the field. Electromagnetic interference, damaged infrastructure, the chaos of real operations—you can't simulate that. They need to see if the technology holds up when it matters.
And the multinational aspect—why is that important?
Because modern NATO operations aren't Spanish operations anymore. Five countries are working together in that battlegroup. If the 5G network can't help them all communicate seamlessly, in their own languages, in real time, then it's not solving the actual problem.
The AI translation piece seems significant. How does that change things?
It removes a bottleneck. Right now, when a Spanish commander needs to coordinate with a Czech unit, someone has to translate. With AI doing that in real time, decisions move faster. Commanders see the same picture at the same moment.
Is this just about speed, or is there something deeper?
It's about resilience. If one communications line goes down, the network adapts. If conventional systems fail, 5G keeps command and control alive. In a contested environment, that's the difference between coordinated action and chaos.
What happens after the test? Does this become standard?
That's what they're trying to figure out. They'll collect lessons learned, see what worked and what didn't, and use that to write the doctrine for the next generation of NATO communications. If it works here, it becomes the template everywhere.