W. Va. Code § 15-1-6: Federal law and regulations.

a. The duty of maintaining and governing the military forces of the state not in the service of the United States rests upon the state, subject to Constitutional authority. The purpose of such forces are twofold; national defense and service of the state. Their efficiency for both purposes necessarily depends upon systematic uniformity in organization, composition, arms, equipment, training and discipline with the Armed Forces of the United States and the military forces of other states. Therefore, the Governor shall cause the military forces of the state to conform to all federal laws and regulations applicable to the same, unless the same shall be incompatible with the state purpose of such forces.

b. All matters relating to the organizations, discipline and government of the military forces of the state, not otherwise provided for in this chapter or in regulations, shall be decided by custom, usage and regulations of the Armed Forces of the United States.