This is Caleb’s reading of official Air Force material; however, this specific recording/audible version of the “Purple Book” is not affiliated with the United States Air Force…just one Airman’s initiative to help others. 

Air Force Foundational Documents: https://www.airuniversity.af.edu/Foundational-Resources/ 

The Purple Book: https://www.doctrine.af.mil/Portals/61/documents/Airman_Development/PurpleBook.pdf 

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