Book excerpt: For nearly two decades the United States Air Force (USAF) oriented the bulk of its thinking, acquisition, planning, and training on the threat of a Soviet blitzkrieg across the inter German border. The Air Force fielded a powerful conventional arm well rehearsed in the tactics required to operate over a central European battlefield. Then, in a matter of days, the 1990 invasion of Kuwait altered key assumptions that had been developed over the previous decade and a half. The USAF faced a different foe employing a different military doctrine in an unexpected environment. Instead of disrupting a fast paced land offensive, the combat wings of the United States Central Command Air Forces (CENTAF) were ordered to attack a large, well fortified, and dispersed Iraqi ground force. The heart of that ground force was the Republican Guard Forces Command (RGFC). CENTAF's mission dictated the need to develop an unfamiliar repertoire of tactics and procedures to meet theater objectives. How effectively did CENTAF adjust air operations against the Republican Guard to the changing realities of combat? Answering that question is central to this study, and the answer resides in evaluation of the innovations developed by CENTAF to improve its operational and tactical performance against the Republican Guard. Effectiveness and timeliness are the primary criteria used for evaluating innovations.