The United States Marine Corps Master Brief Sheet (MBS) is a comprehensive document that provides a detailed snapshot of a Marine’s career and qualifications. It includes personal information, billet descriptions, MOSs, and a complete history of the Marine’s military education, training, and certifications. The MBS also highlights Marine’s achievements, awards, professional military education, and any civilian education that contributes to their development and skill set. Designed to support career progression and performance evaluations, the MBS is an essential tool for leaders to assess a Marine’s readiness, qualifications, and potential for future assignments and promotions. By maintaining accurate and updated information, the MBS is a valuable resource for the Marine and the chain of command, facilitating informed decision-making and career planning.