Which Army Regulation governs the activities of the Red Cross?

The correct regulation that governs the activities of the Red Cross is AR 930-5. This regulation specifically outlines the policies and procedures for the operation of the American Red Cross within the Army and its interaction with military personnel and their families. It addresses areas such as the support the Red Cross provides to soldiers, their dependents, and the overall partnership between the Army and the Red Cross in delivering services related to emergency communications and family assistance.

The other options do not pertain to the Red Cross's activities. For example, AR 601-280 focuses on Army Retention Program policies, which deal with retaining qualified personnel in the Army. AR 600-100 addresses the Army's leadership ethics and the standards expected of all soldiers but does not govern the Red Cross. AR 300-20 relates to Army programs supporting military families and individuals, but it does not specifically cover Red Cross operations.