If a soldier feels discriminated against at work, what document outlines the procedure to file a complaint?

The correct choice is AR 600-20, which is the Army's regulation that addresses the policies and procedures for command, including the Equal Opportunity program. This regulation specifically provides guidance on how soldiers can address issues of discrimination and harassment, outlining the steps to file a complaint within the Army. Understanding AR 600-20 is crucial for promoting a respectful and inclusive environment, as it delineates the responsibilities of both leaders and soldiers in handling such complaints.

The other documents listed, while important in their own right, do not focus on the procedures for filing complaints related to discrimination. For example, AR 670-1 deals with wear and appearance of Army uniforms, FM 7-22 focuses on physical readiness training, and DA PAM 600-25 discusses aspects of mentorship and sponsorship programs. Thus, AR 600-20 is the relevant regulation for soldiers seeking to understand how to report discrimination in the workplace.