What year was the unofficial publication titled the Noncommissioned Officers Manual published?

The Noncommissioned Officers Manual was published in 1909, marking an important step in the development of training and professional standards for noncommissioned officers (NCOs) in the U.S. Army. This unofficial manual aimed to provide guidance, resources, and expectations for NCOs, thereby enhancing their leadership capabilities and technical proficiency. The publication was significant because it recognized the vital role NCOs play in maintaining discipline, managing troops, and ensuring the effective execution of military operations. This timing also reflects the growing emphasis on establishing formalized training methods and documentation within the military, contributing to the evolution of the NCO corps. The other years listed either precede or follow this publication, which places it firmly in the year 1909 as a pivotal moment in military history.