Which document outlines NCO duties and responsibilities?

The document that outlines Non-Commissioned Officer (NCO) duties and responsibilities is the Army Techniques Publication (ATP) 3-75. This publication provides comprehensive guidance on the roles, responsibilities, and expectations placed on NCOs within the U.S. Army, specifically in relation to the Ranger Regiment. It emphasizes the importance of NCO leadership, training, and development, and serves as a critical resource to help NCOs understand their influence in various operational contexts.

In contrast, the other options focus on different areas: FM 3-11 deals with chemical, biological, radiological, and nuclear operations; AR 670-1 covers the wear and appearance of Army uniforms; and TC 7-22.7 is focused more on physical training and performance. These documents, while important, do not specifically address NCO duties and responsibilities, thus making ATP 3-75 the correct choice for this question.