The Sixth Domain: A New Era of Warfare
Over the past 15 years, America’s military services and foremost military thinkers have recognized that modern domains of warfare have expanded – from land, sea, and air – to space and the virtual realm of cyber. As valuable as this expanded concept of warfighting is, it is no longer enough.
The Need for a New Sixth Domain Way of Thinking
The past 12 months of global armed conflicts have demonstrated clearly that America must adopt a new Sixth Domain way of thinking if it is to successfully defend itself and its interests in the immediate and long-term future.
The Sixth Domain is not defined by geography. It’s a new kind of conflict in which autonomy and networked systems allow thousand-dollar consumer electronics to destroy multi-million-dollar conventional weapons systems. Defenses built for one-to-one conflict are ineffective in The Sixth Domain.
The Asymmetry of the Sixth Domain
The fundamental asymmetry of this new domain requires more than innovative technology. It demands national security expertise that moves at Silicon Valley speed and technology based in hardware and defined by software, rapidly updated with code that can scale and evolve as fast as any threat.
Neo-Primes like Epirus that fuse the industry know-how of defense behemoths with the venture capital funding, corporate agility, and rapid system iteration of Silicon Valley, are built specifically for this new type of warfare.
The Spider’s Web Operation
The need to focus on The Sixth Domain was vividly illustrated on June 1, 2025, Russia’s Military Transport Aviation Day, a significant holiday for Russian armed forces. In an operation codenamed Spider’s Web, the Security Service of Ukraine carried out an unprecedented, coordinated drone strike deep inside Russian territory.
The operation targeted four strategic air bases and struck more than 40 high-value aircraft, a major portion of Moscow’s long-range bomber fleet representing 34 percent of Russia’s strategic cruise missile delivery platforms.
The One-to-Many Imperative
Combatting Sixth Domain threats requires a new mentality, a new approach, and new organizational infrastructure. The One-to-Many Imperative posits massed, robotic, asymmetric, and progressively more autonomous attacks across all domains, similar to cyber attacks that oversaturate and overwhelm virtual defenses.
Exploits in The Sixth Domain, however, are also kinetic. They are akin to the ‘physical cyber attack’ Lowery describes.
The Challenge of Defending Against Sixth Domain Threats
Current defense systems aren’t built to defend against saturating physical cyber. These legacy one-to-one defenses lack sufficient magazine depth, command-control capability, and economies of scale to cope with the mass, speed, and complexity of Sixth Domain attacks.
Consider that China annually produces millions of aerial drones – the world’s majority in 2025 – with leading companies like DJI accounting for nearly 70% of the global commercial and recreational drone market.
The Need for a One-to-Many Response
Epirus asserts that defeating asymmetric Sixth Domain threats requires a ‘one-to-many’ technical, tactical, and strategic response. This includes wide-area defense architectures composed of layered systems-of-systems, enabled by human-machine teaming.
Last year, Epirus’ CEO publicly highlighted the potential dominance of ‘centaur warfare’ where machines handle speed and decision complexity, freeing humans to focus on high-level strategy and decision-making.
Conclusion
The Sixth Domain is a new era of warfare that requires a new way of thinking. It demands national security expertise that moves at Silicon Valley speed and technology based in hardware and defined by software, rapidly updated with code that can scale and evolve as fast as any threat.
The need to focus on The Sixth Domain was vividly illustrated by the Spider’s Web operation, which demonstrated the potential of massed, robotic, asymmetric, and progressively more autonomous attacks across all domains.
Combatting Sixth Domain threats requires a new mentality, a new approach, and new organizational infrastructure. The One-to-Many Imperative posits massed, robotic, asymmetric, and progressively more autonomous attacks across all domains, similar to cyber attacks that oversaturate and overwhelm virtual defenses.
Epirus is a company built to address the challenge of modern asymmetric warfare, and a leader in conceptualizing The Sixth Domain. The company’s high-power microwave (HPM) defense platform, Leonidas, is designed to address the challenge of modern asymmetric warfare.
The Sixth Domain is a new era of warfare that requires a new way of thinking. It demands national security expertise that moves at Silicon Valley speed and technology based in hardware and defined by software, rapidly updated with code that can scale and evolve as fast as any threat.
