Which regulation is critical for understanding enlisted promotion procedures?

The regulation that is critical for understanding enlisted promotion procedures is AR 600-8-19. This Army Regulation specifically outlines the policies and procedures for the promotion and reduction of enlisted soldiers, including guidelines for the promotion system, selection process, and various types of promotions such as temporary and permanent. It provides essential details on the career management of enlisted personnel, including requirements for both the eligibility criteria and the promotion boards.

While other regulations mentioned may cover related topics—such as the assignment of military personnel, awards, and pay—AR 600-8-19 is explicitly focused on the promotion aspects, making it the foundational document for anyone needing to understand the promotion process within the enlisted ranks.