Which Army Regulation outlines commanders' responsibilities for establishing a positive climate?

The correct choice highlights Army Regulation 600-20, which specifically deals with command policy regarding the establishment and maintenance of a positive command climate within units. This regulation emphasizes the importance of leaders fostering an environment that encourages open communication, inclusivity, and respect among all Soldiers and personnel.

AR 600-20 outlines the roles of commanders in shaping the behavior, attitudes, and overall moral of their soldiers, underscoring leadership responsibilities in promoting a healthy organizational culture. By setting the tone at the top, commanders can influence the unit's morale and effectiveness, leading to better performance and cohesion among troops.

The other regulations listed do not have a direct focus on the climate within the unit. For example, AR 700-86 deals with the Army's supply policies, while AR 500-2 addresses emergency management and operational readiness. AR 400-10 is more focused on environmental and safety considerations. Therefore, they do not encompass the specific responsibilities regarding the command climate as detailed in AR 600-20.