Which publication is the correct reference for information on conduct and proficiency marks?

The correct reference for information on conduct and proficiency marks is MCO P1070.12. This publication provides detailed guidelines and standards for the formation and evaluation of conduct and proficiency marks within the Marine Corps. It outlines the criteria for performance assessments and the factors that should be considered when evaluating a Marine's conduct and professionalism. By utilizing this manual, Marines can understand the expectations associated with their conduct, which ultimately influences their evaluations and future opportunities within the Corps.

Other publications, while important in their own right, focus on different aspects of Marine Corps operations and policies. Therefore, MCO P1070.12 specifically addresses the conduct and proficiency marks, reinforcing the importance of adherence to established standards in these areas.