Which regulation outlines the procedures and eligibility for promotions and reductions in rank?

The regulation that outlines the procedures and eligibility for promotions and reductions in rank is AR 600-8-19. This regulation specifically focuses on the Army's enlisted promotions and reductions, detailing the policies and procedures that govern the promotion system for enlisted personnel. It includes information about the eligibility requirements for promotions based on time in service, time in grade, and performance evaluations, as well as the appropriate procedures for processing reductions.

Understanding the significance of AR 600-8-19 is essential for personnel involved in the promotion and reduction process, as it provides clear guidelines that ensure fairness and consistency across the Army.