This U.S. Air Force study reference, dated 1 Oct 2017, is for Airmen studying for promotion to Tech Sergeant. It is based on Air Force Handbook 1, The Airman Handbook, 2017-2019 edition. UPDATE: As of 1 Oct 2019, this book has been superseded by the newest version of the Air Force Handbook and its corresponding study guides, dated 1 Oct 2019. Use this version only if testing out of cycle.