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The risks of war over the next ten to 15 years will largely derive from perceptions of shifts in regional correlations of force.

• With U.S. conventional forces reduced in size, China—and, to a lesser extent, Russia—will narrow the qualitative gap.
• These great-power states might calculate that the United States lacks sufficient capacity—in some cases, the capability—to respond effectively. If wars result, they will be multidomain conflicts fought under an ever-present risk of nuclear escalation.

Gray-zone tactics are likely to ramp up

• Despite the leveling playing field, China and Russia likely will prefer to achieve their objectives with the least cost in international reproach and the lowest risk of provoking military conflict with the United States.
• Iran and North Korea are also likely to employ gray-zone tactics in pursuit of their regional objectives.

Asymmetric warfare is also a possibility

• Iran and North Korea do not have—and are unlikely to develop—capabilities to match those of the United States and its regional allies.
• They will have selected asymmetric capabilities to deter U.S. intervention, and U.S. forces will need to contend with those adversaries' large but less-sophisticated forces.

States' monopoly on violence could weaken

• The use of substate actors as proxy fighters in gray-zone strategies will continue weakening the state's monopoly on violence in many areas of the world.
• As aggressive states arm individuals and groups in regions they seek to destabilize or annex, the weaker states will have difficulty containing the violence that results and likely will turn to the United States for support.

Developments in military applications of artificial intelligence might help the U.S. maintain superiority if it can leverage these technologies effectively.

• Advanced systems could restore U.S. qualitative advantages in conventional warfare and provide capabilities to process data in ways that enable U.S. forces to identify and target substate adversaries more effectively.
• However, these capabilities also come with serious risks that will need to be managed, and the United States will not have a monopoly on access to them.

This volume of the Future of Warfare series examines some of the most significant factors shaping military trends over the next ten to 15 years: changes in the size, quality, and character of military forces available to the United States and its potential adversaries. The report identifies six trends that will shape who and where the United States is most likely to fight in the future, how those wars will be conducted, and why they will occur. These trends are: decreasing U.S. conventional force size, increasing near-peer conventional modernization and professionalization, continuing development of asymmetric capabilities by second-tier powers, increasing adversary use of gray-zone tactics, continuing democratization of violence, and emerging artificial intelligence as a class of disruptive technologies.

• Chapter One

  Military Trends

• Chapter Two

  Trend 1: Decreasing U.S. Conventional Force Size

• Chapter Three

  Trend 2: Increasing Modernization and Professionalization of Near-Peer Forces

• Chapter Four

  Trend 3: The Development of Asymmetric Strategies by Second- Tier Powers

• Chapter Five

  Trend 4: Potential Adversaries' Increasing Use of "Gray Zone" Tactics

• Chapter Six

  Trend 5: A Weakening of the State's Monopoly on Violence

• Chapter Seven

  Trend 6: AI as a Class of Potentially Disruptive Technologies

• Chapter Eight

  Conclusion: Understanding the Eroding "Competitive Military Advantage"