Final answer:
The guideline referring to rewarding and punishing based on established standards and traditions in the Marine Corps is 'Discipline'.
Step-by-step explanation:
Ensuring reward and punishment based on the Marine Corps established standards and traditions is a task that refers to the guideline of Discipline the Marine Corps provides for applying/ensuring ethical behavior. Discipline in this context is the adherence to the code of conduct and the enforcement of rules that shape the behavior and actions of Marine Corps members. This concept is essential for maintaining order, structure, and efficiency within the military institution, fostering mutual respect, and enabling the success of missions through cohesive action.