A2/AD and Wars of Necessity

Why we need to focus our defense planning on beating anti-access/area-denial strategies, and why they aren't new.

The ongoing and often contentious debate concerning AirSea Battle has focused on whether the concept constitutes an adequate “strategy” for the United States. Moving beyond the simple observations that a concept in itself is not a strategy, and that most aspects of the Pentagon’s AirSea Battle effort remain (at least publicly) unclear, the debate tends to conflate proposals for methods of countered anti-access strategies with the necessary planning for potential wars of necessity. Unlike wars of choice, wars of necessity can’t just hurt America or our economic or political standing in the world—but can literally destroy us. To understand how the debate gets off track requires us to examine, first, the history-spanning strategy that is anti-access warfare, and, second, the reality that anti-access warfare is but one aspect of a much larger planning challenge—how to deter or, if unfortunately necessary, successfully fight a major war against a hoping-to-someday-be-a-near-peer-competitor opponent. Hopefully, the AirSea Battle effort is more about the latter rather than merely the former, as important as it is.

Wars of Necessity

Those number of nations against which we could potentially fight a war of necessity remains mercifully small: China; Iran; North Korea; Russia in the “near abroad” or in the eastern NATO states. Most other conflicts that we could potentially intervene or get drawn into by our own political decisions are indeed wars of choice. Syria, for example, is a humanitarian disaster with tremendous suffering, but if the United States does not intervene, the effects on us remain indirect. At worse, an Assad victory will result in greater Iranian influence in areas where they already have influence. Morality or support for democracy aside, it will not shake our position in this world. This is not to say that it may not be appropriate to intervene, only that we should not build or optimize our armed forces to fight in Syrias. We should optimize our military strength to break through the anti-access networks that will constitute the initial and (if we are successful) dominant operational phase of a war of necessity. Given the relative global military power today and for the immediate future—at least the next twenty years—any war of necessity (and some wars of choice) will require a U.S. capability to defeat anti-access/area-denial weapons and strategies.

What Makes the Concept of Anti-Access Warfare Unique?

Anti-access and area denial are modern terms referring to war-fighting strategies focused on preventing an opponent from operating military forces near, into or within a contested region. Today anti-access and area-denial strategies—sometimes combined as anti-access/area denial or abbreviated as A2/AD—are designated in our national strategic guidance as primary strategic challenges to the international security objectives of the United States and its allies and partners. However, in addition to anti-access and area denial being modern terms and strategic challenges, they are techniques of strategy that have been used throughout military history. They are also historical components of grand strategy, having been used or attempted by Imperial Japan, Argentina after capturing the Falklands/Malvinas, Nazi Germany in the later stages and Great Britain in the opening phases of the Second World War, Ottoman Turkey, Elizabethan England, ancient Greeks versus the Persian Empire, and others. Along with the obvious military aspects, anti-access strategies include political, diplomatic and economic tactics, something that official documents, such as the CJCS Joint Operational Access Concept (JOAC), acknowledge but have not examined.

Denying access to an enemy is a natural objective for any defender and should be considered an integral component of any military campaign. However, the terms anti-access and area denial—as currently used—are specifically meant to denote a strategic approach intended to defend against an opponent that is judged to be of superior strength or skill in overall combat operations. If the opponent is allowed to use this superior strength or skill, it is feared that the defender would likely be defeated at the point of contact. Therefore, the objective of an anti-access or area denial strategy is to prevent the attacked from bringing its operationally superior force into the contested region, or to prevent the attacker from freely operating within the region and maximizing its combat power.

The uniqueness of the anti-access approach is that it is specifically designed to prevent regional access against an out-of-area global power that the defender cannot otherwise defeat. The impetus for its modern adoption was the primary “lesson learned” from the Gulf War of 1991, where an American-led coalition strongly entrenched in the theater collapsed a numerically superior army in days.

From History to Today