What did Friedrich von Steuben write to standardize the duties of the NCO Corps?

Friedrich von Steuben authored "Regulations for the Order and Discipline of the Troops of the United States," which played a crucial role in standardizing the duties and responsibilities of the Non-Commissioned Officer (NCO) Corps. This manual was developed during the American Revolutionary War and set forth a structured approach to military training and discipline. Von Steuben's insights were instrumental in transforming the Continental Army into a more effective fighting force, emphasizing the importance of order, training procedures, and clear expectations for NCOs, which helped to ensure that soldiers were well-prepared and disciplined.

The other choices do not accurately reflect von Steuben's contributions or their significance. "Manual of Military Tactics" focuses on tactical maneuvers rather than NCO duties specifically. "Army Learning Guide" is a more contemporary term that does not relate to von Steuben's historical work. Additionally, "Drill and Ceremonies Handbook" pertains to specific drill procedures but does not encompass the comprehensive guidelines for NCO conduct and discipline that von Steuben outlined.