Which regulation governs the investigations of Equal Opportunity (EO) Complaints?

The regulation that governs the investigations of Equal Opportunity (EO) complaints is AR 600-20. This regulation outlines the Army's policy regarding EO, including the procedures for addressing and investigating complaints related to discrimination and harassment based on race, color, religion, gender, or national origin. It explicitly specifies the framework and responsibilities for managing EO programs, ensuring that all personnel have equal access and opportunities free from discrimination or harassment.

While AR 15-6 pertains to investigations and specifically establishes investigative procedures, it is not dedicated to EO complaints. Instead, AR 600-20 directly addresses the EO compliance and investigative processes within the Army structure. This focus on equal opportunity issues and the specific procedures associated with them is what makes AR 600-20 the correct answer.