ELBRIDGE COLBY: ARCHITECT OF MODERN U.S. DEFENSE STRATEGY
INTRODUCTION: THE RISE OF ELBRIDGE COLBY IN U.S. DEFENSE POLICY
Elbridge Colby stands as one of the most influential figures in shaping contemporary American defense strategy. As Under Secretary of Defense for Policy, Colby has risen to the forefront of national security decision-making, driving a strategic vision that prioritizes great power competition, especially against China. His nuanced approach, rooted in realism, has not only impacted U.S. military posture but has also initiated debates across Washington and among American allies. With a reputation for decisiveness and intellectual rigor, Colby’s career offers a window into the evolving landscape of global security challenges and the U.S. response.
From his early roles in government to his leadership in drafting major defense strategies, Colby’s trajectory mirrors the shifting priorities of American defense planning. His advocacy for containing China, recalibrating commitments in Europe and the Middle East, and building coalitions in Asia has become a defining feature of U.S. foreign policy. As the international order faces unprecedented tests, understanding Elbridge Colby’s philosophy and influence is essential for anyone seeking to comprehend the future direction of U.S. security policy.
Colby’s impact extends beyond his official titles. Through his work at influential think tanks and the publication of widely read books, he has helped shape the intellectual foundations of American defense thinking. Yet, his assertive style and willingness to challenge established norms have also sparked controversy, both at home and abroad. In this comprehensive exploration, we delve into Colby’s background, strategic priorities, the confirmation process, his leadership team, and the debates his policies have sparked, offering readers a detailed and nuanced portrait of one of today’s most consequential defense strategists.
ELBRIDGE COLBY’S ASCENT: FROM POLICY EXPERT TO UNDER SECRETARY OF DEFENSE
Elbridge Colby’s appointment as Under Secretary of Defense for Policy marked a pivotal moment for U.S. national security leadership. In this role, Colby serves as the principal adviser to the Secretary of Defense on matters of defense policy, strategy, and international security affairs. His strategic vision—centered on countering the rise of China as a peer competitor—has rapidly become the guiding principle for the Department of Defense’s planning and operations.
Colby’s confirmation process reflected both the significance of his role and the contentious nature of modern defense debates. While his nomination drew broad bipartisan support, there was notable resistance from certain Republican circles, particularly concerning his positions on Iran and Middle East policy. Despite this, only one senator ultimately voted against his confirmation, signaling widespread recognition of Colby’s expertise and the urgent need for his strategic perspective in today’s security environment.
Central to Colby’s approach is a fundamental reorientation of U.S. defense priorities. He has advocated for reducing military commitments in Europe and the Middle East, arguing that the United States should concentrate resources on the Indo-Pacific region, where China’s growing military capabilities pose the most direct challenge to American interests. This shift is not merely theoretical; it is reflected in budget allocations, force posture decisions, and alliance diplomacy. Colby’s leadership team—composed of trusted advisors like Austin Dahmer and Alexander Velez-Green, both of whom have connections to Senator Josh Hawley and The Heritage Foundation—further underscores the ideological coherence and policy discipline that characterize his tenure.
Colby’s approach is grounded in a belief that the United States must maintain the credible capacity to deter and, if necessary, defeat aggression by great power adversaries. This conviction is supported by a growing body of defense analysis, which points to China’s rapidly expanding naval and missile forces, its aggressive regional policies, and its sustained efforts to undermine U.S. alliances in Asia. According to the International Institute for Strategic Studies, China’s defense spending has doubled over the past decade, making it the world’s second-largest military power. For Colby, meeting this challenge requires not only modernizing U.S. capabilities but also forging stronger partnerships with key allies such as Japan, Australia, and South Korea.
THE STRATEGIC FOCUS: CONTAINING CHINA AND THE SHIFT FROM EUROPE AND THE MIDDLE EAST
At the core of Elbridge Colby’s defense philosophy lies a paradigm shift in U.S. strategic priorities. While previous decades saw the United States deeply engaged in Europe and the Middle East, Colby argues that the most pressing threat now comes from China’s rise as a global power. This “strategic prioritization” has become the cornerstone of the National Defense Strategy under his leadership.
Colby’s approach is built on a clear-eyed assessment of the international security environment. He asserts that the era of unipolar American dominance has ended, replaced by a world in which great power competition—especially with China—defines the primary security challenge. In his influential writings, including the widely cited book “The Strategy of Denial,” Colby lays out a framework for how the United States should organize its military, diplomatic, and economic resources to prevent China from dominating Asia. He contends that a failure to do so would have devastating consequences for global stability, the U.S. economy, and the security of America’s allies.
This strategic focus has practical implications. Under Colby’s guidance, the Department of Defense has sought to rebalance its force posture, investing in capabilities such as long-range precision strike, missile defense, and advanced cyber operations tailored to counter Chinese military advancements. Real-world examples abound: the U.S. has increased joint exercises with Australia in the South Pacific, expanded naval operations in the South China Sea, and deepened security cooperation with Taiwan. In 2023 alone, the U.S. conducted over 200 bilateral and multilateral exercises in the Indo-Pacific region, a significant increase from previous years.
At the same time, Colby’s strategy calls for a measured reduction of U.S. military presence in Europe and the Middle East. He argues that while these regions remain important, they no longer represent the central theater of global competition. Instead, he advocates for European allies to take greater responsibility for their own defense—a vision reflected in recent moves by NATO countries to boost their defense spending. In the Middle East, Colby supports a more focused approach that limits U.S. involvement to counterterrorism and the protection of vital interests, rather than large-scale military engagements.
Critics of this approach warn that reducing commitments in Europe and the Middle East could create security vacuums. However, Colby counters that strategic discipline is essential if the U.S. is to maintain a credible deterrent in the Indo-Pacific. This debate is ongoing, but there is little doubt that Colby’s vision has already reshaped the contours of American defense planning.
SHAPING NATIONAL SECURITY: FROM THE 2018 NATIONAL DEFENSE STRATEGY TO THINK TANK LEADERSHIP
Before ascending to the position of Under Secretary, Elbridge Colby played a central role in drafting some of the most consequential U.S. security documents of recent decades. As Deputy Assistant Secretary of Defense for Strategy and Force Development during the Trump administration, Colby was instrumental in the creation of the 2017 National Security Strategy and the 2018 National Defense Strategy (NDS). These documents marked a watershed moment, signaling a shift from counterterrorism and regional conflicts toward an explicit focus on great power competition.
The 2018 NDS, in particular, is widely recognized as a turning point in U.S. defense policy. For the first time since the end of the Cold War, the strategy elevated China and Russia as principal competitors, relegating terrorism to a secondary concern. Colby’s fingerprints are evident throughout the document, from its emphasis on “deterrence by denial” to its call for a more agile, technologically advanced military. The strategy also highlighted the need for integrated campaigning—combining military, diplomatic, economic, and informational tools to achieve U.S. objectives.
Implementing these changes was not without challenges. Colby faced bureaucratic resistance from elements within the Pentagon who were reluctant to abandon established priorities. However, he found strong support from the Air Force and Navy, both of which saw the necessity of adapting to new threats. Colby’s ability to navigate these internal dynamics speaks to his skill as both a strategist and a leader.
Beyond government service, Colby has continued to shape defense thinking as co-founder of The Marathon Initiative, a Washington-based think tank dedicated to the study of great power competition. The organization conducts research, hosts policy forums, and publishes analysis on how the U.S. should respond to the challenges posed by rivals like China and Russia. Through this platform, Colby has influenced a new generation of defense analysts and policymakers, ensuring that the strategic focus on great power rivalry remains at the center of American security debates.
Colby’s book, “The Strategy of Denial: American Defense in an Age of Great Power Conflict,” has further cemented his reputation as a leading thinker on national defense. The book’s thesis—that the United States must prevent hostile powers from establishing regional hegemony through a strategy of denial—has been widely discussed in academic, military, and policy circles. It has been cited in congressional hearings, referenced in allied capitals, and used as a textbook in war colleges, underlining its impact on the broader defense community.
LEADING THE DEFENSE TEAM: A COHERENT VISION AND DYNAMIC ADVOCACY
Elbridge Colby’s leadership style is characterized by intellectual rigor, decisiveness, and the ability to assemble strong teams. As Under Secretary of Defense for Policy, he has surrounded himself with advisors who share his strategic outlook and commitment to realist principles. Key members of his team, including Austin Dahmer and Alexander Velez-Green, bring deep experience in both legislative and policy arenas, with backgrounds that connect them to influential voices such as Senator Josh Hawley and The Heritage Foundation.
This team-based approach has allowed Colby to drive policy coherence across the Department of Defense. Through regular strategy sessions, war games, and interagency coordination, Colby and his advisors ensure that U.S. defense planning remains tightly aligned with overarching strategic objectives. Their work has contributed to the modernization of warfighting concepts, the integration of emerging technologies, and the strengthening of U.S. alliances in Asia.
A key real-world example of this teamwork is the recent rollout of the Defense Innovation Initiative, which aims to accelerate the adoption of artificial intelligence, hypersonic weapons, and autonomous systems across the military. Under Colby’s guidance, the Department has launched partnerships with leading tech firms and expanded its collaboration with allied innovation hubs. According to the Congressional Research Service, U.S. investment in defense technology now exceeds $100 billion annually, reflecting the high priority placed on maintaining a technological edge over adversaries.
Colby’s advocacy extends beyond the Pentagon. He is a frequent speaker at international security conferences, where he articulates the rationale for U.S. strategy and addresses concerns from allies and partners. His ability to engage with foreign officials, explain complex policy decisions, and build support for U.S. initiatives has been crucial in rallying international cooperation against Chinese aggression. For example, after a major speech outlining U.S. plans for Indo-Pacific defense, several Southeast Asian countries increased their defense spending and signed new agreements with the U.S., demonstrating the practical impact of Colby’s advocacy.
Despite these successes, Colby’s assertive style has sometimes sparked internal friction. His willingness to challenge conventional wisdom and push for rapid change has made him a polarizing figure within the broader defense establishment. However, his supporters argue that bold leadership is necessary to meet the unprecedented challenges of great power competition.
CONTROVERSY AND DEBATE: CRITICS, ALLIES, AND THE FUTURE OF U.S. DEFENSE POLICY
No major shift in defense policy occurs without controversy, and Elbridge Colby’s tenure has been no exception. His “shoot first and ask questions later” approach to security challenges has drawn criticism from various quarters, including some of America’s closest allies and influential voices within his own party. Notably, officials in Japan have expressed concerns that Colby’s policies, while intended to strengthen deterrence, may inadvertently escalate tensions with China and place allied nations at greater risk.
Some Republican hawks, who have traditionally favored a more assertive U.S. posture in the Middle East and Europe, worry that Colby’s focus on China comes at the expense of other vital interests. They argue that a sudden reduction in American presence could embolden adversaries like Iran and Russia, destabilizing regions where U.S. influence has long been a stabilizing force. These critics point to recent developments in the Middle East, where Iranian-backed groups have increased their activities amid perceptions of reduced U.S. attention.
Within the Pentagon, Colby’s forceful advocacy for rapid strategic realignment has caused frustration among career officials accustomed to more incremental change. Some have raised concerns about the feasibility of simultaneously modernizing the military, reducing overseas commitments, and sustaining deterrence across multiple theaters. These debates have occasionally spilled into the open, with media reports highlighting tensions between Colby’s team and other senior defense leaders.
Despite these challenges, Colby has remained steadfast in his conviction that “strategic discipline” is the only way to ensure U.S. security in an era of great power competition. He points to historical precedents, such as the U.S. pivot to Europe during the early Cold War, as evidence that major realignments are both necessary and possible. Supporters argue that Colby’s willingness to make tough choices is exactly what is needed to avoid strategic overstretch and ensure the long-term sustainability of U.S. power.
Real-world examples underscore the stakes of these debates. In recent years, the U.S. has faced simultaneous crises in Asia, Europe, and the Middle East, testing the limits of American military capacity. According to the Stockholm International Peace Research Institute, U.S. defense spending remains the highest in the world, but the number of active-duty personnel and forward-deployed forces has declined since 2008. The challenge, as Colby sees it, is to make smarter, more focused use of available resources—a task that requires both vision and discipline.
CONCLUSION: ELBRIDGE COLBY AND THE FUTURE OF AMERICAN DEFENSE STRATEGY
Elbridge Colby’s career stands as a testament to the power of ideas in shaping national security policy. As Under Secretary of Defense for Policy, he has driven a dramatic reorientation of U.S. defense priorities, placing the competition with China at the heart of American strategy. His work on the National Defense Strategy, his leadership at The Marathon Initiative, and his influential writings have all contributed to a broader shift in how the United States understands and responds to the challenges of a multipolar world.
Colby’s emphasis on strategic discipline, alliance-building in Asia, and the modernization of U.S. military capabilities reflects both a deep understanding of history and a clear vision for the future. While his approach has sparked debate and controversy, it has also forced policymakers, allies, and critics alike to grapple with the hard choices that define contemporary security policy.
Looking ahead, the impact of Elbridge Colby’s ideas will continue to shape U.S. defense planning for years to come. As new challenges emerge—whether in the Indo-Pacific, Europe, or beyond—the principles of realism, prioritization, and innovation that Colby champions will remain central to the ongoing debate about America’s role in the world. For those seeking to understand the future of American defense, the career and philosophy of Elbridge Colby offer invaluable insights into the challenges and opportunities that lie ahead.
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