Chapter 2 provides a historical account of the development of tactical air power during the interwar period and World War II in Germany, the Soviet Union, Great Britain, and the United States. Air and ground force coordination has largely been ignored in peacetime, and only in combat has a sense of urgency arisen for developing and refining joint doctrine. Even then, the focus has been on defining air and ground command relationships and improving the coordination between an air force’s tactical air control systems (TACS) and the army’s air–ground systems (AAGS). These doctrinal efforts increased the efficiency of allocating and controlling air power to support ground operations. However, largely left unspoken and unwritten has been an understanding of why, how, and when tactical air power works. TAP theory answers these questions by asserting that air power’s asymmetric advantage is its ability to locate and attack massed and maneuvering armies. With air superiority secured, lethal air-to-ground forces threaten armies, causing them to disperse and hide. The enemy’s reaction, in turn, provides friendly ground forces an advantage in conducting both offensive and defensive operations. Unfortunately, a theory explaining the primary impact of air power in modern warfare has been absent until now.

Since the end of the Cold War there has been an age of primacy marked by a series of conflicts for which powerful states have chosen to go to war over nonvital interests against much weaker state or nonstate actors. In these asymmetric conflicts, the powerful have coerced concessions, imposed regime change, and suppressed the spread of violence through counterterrorism or counterinsurgency operations. Powerful nations have largely succeeded in achieving both their military and political objectives by taking advantage of asymmetries in technology to wage war from afar, at low risk to their own forces. War outcomes have not, however, always translated into broader foreign policy objectives of long-term peace and stability. This introductory chapter provides an overview of the evolution of air power theory, presents characteristics of contemporary air warfare and measures of military and political effectiveness, and then briefly assesses the ten air wars examined in subsequent chapters.