What must a Marine on light duty do regarding BCMAP standards?

The correct choice emphasizes that a Marine on light duty must still adhere to Body Composition Program (BCP) standards, even if they are pending their medical screenings or are recovering from an injury. This is crucial because the BCP is designed to maintain the physical readiness and overall health of Marines. Compliance with the program is essential to ensure that all service members, regardless of their current physical limitations, are held to the same standards. This approach reinforces accountability and motivates Marines to stay within the guidelines of the program during their recovery period, fostering a culture of discipline and commitment.

Focusing on the other options, ignoring BCMAP standards during recovery or only following BCP standards if cleared by a doctor does not align with the intention of the standards, which are in place to ensure consistent physical fitness among all Marines. Participation in all physical assessments may not be feasible for a Marine on light duty due to their physical limitations, so this is not a requirement under the circumstances. Hence, adhering to BCP standards is necessary, as it emphasizes the commitment to maintaining readiness despite individual circumstances.