What is commonly referred to as "The Blue Book" in military drill?

"The Blue Book" commonly refers to the drill manual established by Baron Von Steuben, who was instrumental in training the Continental Army during the American Revolutionary War. Published in 1779, this manual provided standardized procedures for military drills, formations, and maneuvers, which were critical for the development of American military discipline and effectiveness. It served as a foundational text for U.S. Army training and has influenced drill practices to this day. This manual is historically significant because it helped shape the professionalism of the American military forces, ensuring that soldiers could perform effectively as a cohesive unit. Understanding this context clarifies why "The Blue Book" is associated with military drill, emphasizing its role in establishing a structured approach to training and discipline in the army.