War is frequently a matter of experimentation and trial-and-error. The wars of the past decade have been no exception. The United States has churned through several warfighting doctrines over the past ten years as elusive adversaries and looming political and financial constraints have forced policymakers to adapt. We are currently witnessing an accelerating decline in the size of the military effort against terrorism. Increasingly, the war against terrorists is fought in the shadows, out of sight, and by civilians or a few commandos seconded to civilian commanders. The vast majority of the U.S. military will soon exit the wars that 9/11 started. And the arrival of heavy financial and political constraints will force U.S. policymakers to develop a real national security strategy for the first time since 1950s. As other security challenges rise up, the War on Terror is already becoming a backwater.

