Which of the following policies does the Marine Corps uphold regarding substance abuse?

The Marine Corps maintains a strict policy of zero tolerance for the illegal use of drugs. This policy is foundational to maintaining discipline, readiness, and the overall mission effectiveness of the Corps. By strictly prohibiting illegal substance use, the Marine Corps ensures that all personnel are fit for duty and able to perform their responsibilities without the impairments that drug abuse can cause. This commitment to a drug-free environment is vital for safety and operational effectiveness, as it helps to cultivate a culture of accountability and professionalism among Marines. Upholding this zero tolerance policy reinforces the necessity of maintaining high standards of conduct and health within the ranks, which is essential for the operational success of the Marine Corps.