Which regulation governs energy conservation within dining facilities?

The correct answer identifies AR 420-1 as the regulation that governs energy conservation within dining facilities. This regulation encompasses the overall management of Army facilities, including guidance on energy efficiency and sustainability practices. In the context of dining facilities, AR 420-1 outlines requirements for managing energy consumption, encouraging initiatives to reduce waste and improve energy efficiency in food service operations.

While other regulations cover different aspects of Army operations or logistical functions, they do not focus primarily on the energy conservation policies relevant to dining facilities. For instance, AR 600-20 primarily deals with Army command policy, AR 700-138 focuses on Army logistics, and AR 735-5 pertains to property accountability, none of which specifically address energy conservation measures in dining operations. Therefore, understanding that AR 420-1 is dedicated to facilities management, including energy conservation in dining facilities, clarifies why this regulation is the correct answer.