How does Army Regulation (AR) 600-20 define duty?

Army Regulation (AR) 600-20 defines duty as the obedient and disciplined performance of assigned tasks and responsibilities. This definition emphasizes the importance of adhering to military standards and protocols, which are critical for maintaining order and effectiveness within the Army. Duty is not merely about completing tasks; it encompasses the demeanor and attitude with which those tasks are performed, reflecting a soldier's commitment to the values of discipline and respect for authority.

The other choices capture important aspects of military life, such as commitment to the team and training, as well as following orders, but they do not encapsulate the complete essence of what duty represents in a military context. Duty is fundamentally about the mindset and conduct expected of soldiers, highlighting their role within the larger framework of military operations, which requires a unified and disciplined approach to their responsibilities.