“Victory in future combat will depend less on individual capabilities and more on integrated strengths of a connected network available for coalition leaders to employ.”

— General David L. Goldfein
U.S. Air Force Chief of Staff (2016–2020)

The Emerging Multi-Domain Battlespace

The strategic environment shaping the United States’ defense posture is undergoing its most significant transformation since the end of the Cold War. For the first time in decades, the U.S. military faces adversaries capable of contesting its power across every domain—land, sea, air, space, cyberspace, and the electromagnetic spectrum. These competitors, most notably the People’s Republic of China, are leveraging advanced technologies, integrated operational concepts, and widening spheres of influence to challenge American military freedom of action in ways that place unprecedented pressure on traditional U.S. advantages.

This shift is most acute in the Indo-Pacific—the world’s most consequential theater and the central arena of today’s contested strategic environment. Geography, technology, and regional security dynamics converge here to create conditions in which rapid, coordinated, cross-domain operations are becoming the defining feature of modern conflict. As Admiral Samuel J. Paparo Jr., Commander of U.S. Indo-Pacific Command, emphasized in his April 2025 Posture Statement, the People’s Liberation Army (PLA) is now conducting “persistent multi-domain pressurization activities” around Taiwan and throughout the region. These operations integrate air, maritime, cyber, and space assets to impose continuous pressure, normalize coercive behavior, and rehearse the very joint operations the PLA would employ in crisis or conflict.

Against this backdrop, the U.S. Joint Force faces a profound challenge: it must not only maintain capability superiority but evolve in ways that allow it to outpace and out-adapt adversaries whose operational models are specifically designed to exploit seams between U.S. domains and services. The United States can no longer rely on dominance within individual domains; it must instead generate advantage through the synchronized employment of effects across all domains—creating dilemmas that overload adversary decision cycles and enabling U.S. forces to operate at a tempo and scale that competitors cannot match.

This new logic of warfare is captured in the doctrine of Multi-Domain Operations (MDO). MDO is not simply an update to joint operations, nor is it driven solely by new technologies. Rather, it represents a fundamental rethinking of how the Joint Force conceives of combat power. It demands integrating capabilities across domains through shared data architectures, resilient communications, distributed sensors, autonomous and semi-autonomous systems, and human-machine teaming. At its core, MDO seeks to achieve convergence—the ability to combine cross-domain effects simultaneously and precisely to penetrate, disintegrate, and exploit adversary defenses while maintaining the initiative.

To enable this approach, the Department of War is developing a digital backbone known as the Combined Joint All-Domain Command and Control (CJADC2), an architecture designed to connect U.S. and allied sensors, decision-makers, and shooters across all domains. CJADC2 aims to give commanders the ability to sense, make sense, and act at the speed required for modern warfare. By accelerating decision cycles and enabling distributed operations, CJADC2 enables MDO to become operationally achievable.

Yet this growing reliance on integrated networks also presents new vulnerabilities. China’s emerging doctrine of Systems Destruction Warfare seeks to paralyze the U.S. military by targeting the very connective tissue—data flows, networks, communications, and sensing architecture—that enables the Joint Force to operate as an integrated system. In response, the United States must ensure that its integrated systems are resilient, redundant, and capable of maintaining operational cohesion even when degraded by cyber, electronic, or kinetic attacks.

This chapter examines the defining military challenge of our era: China’s system-centric approach to warfare and the United States’ response through MDO and CJADC2. It analyzes the evolution of PLA doctrine, the capabilities supporting China’s multi-domain strategy, the U.S. military’s adoption of MDO, the architecture of CJADC2, and the institutional and technological challenges that remain. Ultimately, it argues that America’s strategic edge in the era of competitive multipolarity will depend on its ability to integrate forces across all domains—coherently, rapidly, and in close partnership with allies—while safeguarding the networks and systems that enable such integration.

https://doi.org/10.71236/d9h03gyw