What type of administrative actions can Marines face for not maintaining body composition standards?

Marines who fail to maintain body composition standards can face a range of adverse and administrative actions as a means of ensuring adherence to military regulations. This approach underscores the importance the Marine Corps places on physical fitness and readiness, which are vital for operational effectiveness.

When a Marine does not meet the established body composition standards, it can trigger a process that may lead to various consequences such as counseling, referral to a body composition program, and, in some cases, administrative actions that could affect a Marine's career, including potential separation from service. These measures are designed to maintain the overall discipline and effectiveness of the force.

The other options suggest either a lack of consequence for minor discrepancies or limited actions like verbal warnings, which does not align with the structured accountability that the Marine Corps employs in maintaining its standards. Additionally, the idea of all actions being voluntary contradicts the enforced nature of military regulations, further reinforcing the necessity of compliance with body composition standards.