What is the minimum time Marines should usually have served in a non-promotable status before being considered for promotion?

The minimum time Marines should usually have served in a non-promotable status before being considered for promotion is 6 months. This guideline is designed to ensure that Marines have sufficient time to address any deficiencies or challenges that may have placed them in a non-promotable status, allowing them the opportunity to demonstrate improvement and readiness for promotion.

The rationale behind this period is to provide a balance between holding Marines accountable for their performance and giving them adequate time to rectify any issues. After 6 months, if the Marine has made the necessary improvements or changes, they can be reconsidered for advancement, reflecting the Corps' commitment to developing its personnel while maintaining high standards of readiness and effectiveness.