U.S. Army Soldiers recite the Creed of the Noncommissioned Officer during the NCO Corps birthday celebration at Joint Base Langley-Eustis, Va., Dec. 16, 2016. The “Blue Book,” which outlines the duties and responsibilities of a NCO, was conceived from the training objectives written by Inspector General Friedrich Wilhelm von Steuben in Dec. 1777. (U.S. Air Force photo by Airman 1st Class Derek Seifert)