What is the main responsibility of the Executive Officer (XO)?

The main responsibility of the Executive Officer (XO) is to report to the Commanding Officer (CO) and ensure the organization, duty, and good discipline within the unit. The XO acts as the primary assistant to the CO and often takes on the role of overseeing the daily operations of the unit, ensuring that everything runs smoothly and in accordance with established policies and procedures. This includes maintaining morale, discipline, and performance standards among the personnel, which are essential for the effective functioning of the command.

While the other options may relate to tasks within a unit, they do not encapsulate the overarching responsibilities of the XO. Coordinating logistics for missions, managing personnel evaluations, and developing training programs are important functions, but they fall under the broader umbrella of maintaining the unit's discipline and organization, which is primarily managed by the XO in their role.