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By Greg Hadley

Two of the Air Force’s foundational documents received updates May 6, as the service released new versions of its Blue and Brown Books—“The Profession of Arms: Our Core Values” and “The Enlisted Force Structure,” respectively. The release of the new texts, which lay down many of the core concepts that shape and define the Air Force, comes as the service faces a pivotal moment, transitioning away from conflict in the Middle East to competition with great powers such as China and Russia.