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

SOAs and ESBs did not have this requirement, and thus, often lacked the capability to offer self-service.

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Between 1993 and 2006, that requirement evolved from the desire to maintain the capability to defeat two conventionally armed aggressors to the need to conduct a campaign against a conventional adversary while also waging a long-duration irregular warfare campaign and protecting the homeland against attack.

CENTERFORSECURITYPOLICY: Center for Security Policy | The Measure of a Superpower: A Two Major Regional Contingency Military for the 21st Century | Page: 2