Which regulation outlines guidance for managing enlisted promotions and reductions?

The regulation that outlines guidance for managing enlisted promotions and reductions is AR 600-8-19. This AR specifically addresses the policies and procedures for the Army's enlisted personnel in terms of promotions and reductions, detailing the qualifications necessary for advancement, the responsibilities of commanders, and the administrative processes involved.

Understanding this regulation is crucial for leaders in the Army as it sets the framework for recognizing the achievements and capabilities of enlisted soldiers, ensuring that promotions are conducted fairly and based on established criteria. This includes aspects such as performance evaluations, time in grade, and completion of required training.

The other regulations mentioned serve different purposes: AR 600-19 focuses on the prevention of harassment; AR 600-3 is related to total Army personnel management; and AR 650-1 deals with military food service operations. Therefore, AR 600-8-19 is the appropriate reference for enlisted promotions and reductions, making it the correct answer in this context.