What field manual covers the duties, responsibilities, and authorities of a Noncommissioned Officer (NCO)?

The correct choice is reflected in FM 7-22.7, which is specifically focused on the roles, responsibilities, and authorities of Noncommissioned Officers (NCOs) in the Army. This field manual serves as a comprehensive guide that outlines what is expected of NCOs, the standards they should uphold, and the leadership qualities necessary for success in their positions. Understanding this manual is crucial for NCOs as it provides foundational knowledge that they need to effectively lead, mentor, and train their Soldiers.

The other options do not focus specifically on the duties and responsibilities of NCOs. For example, FM 7-22.6 is related to physical readiness training, while FM 3-21.5 addresses drill and ceremonies. FM 7-8 primarily covers responsibilities for the training of soldiers in a unit context, but it does not delve into the NCO's specific duties and authority as comprehensively as FM 7-22.7. Thus, FM 7-22.7 is the appropriate reference for understanding the vital role of NCOs in the Army structure.