Over time, the requirement evolved from maintaining the capability to defeat two conventionally armed aggressors to a more complex formulation in which the U.S. military was asked to be able to conduct a single campaign against a conventional adversary while waging a long-duration counterinsurgency and stability campaign or protecting the homeland against attack and providing support to civil authorities.

CENTERFORSECURITYPOLICY: Center for Security Policy | The Measure of a Superpower: A Two Major Regional Contingency Military for the 21st Century