Which regulation covers guard duty?

• A. AR 600-20
• B. FM 22-6
• C. AR 15-1
• D. FM 3-90

Answer: (B)

Guard duty relies on a clear set of procedures that tell a sentry exactly how to post up, monitor the area, and respond to anything abnormal. The manual that standardizes these guard-post duties, expectations for sentries, and the steps for relief, alarms, and reporting is FM 22-6. It gives you the exact routines a guard must follow: establishing the post, performing regular checks, recognizing and reporting suspicious activity, and carrying out the required actions if someone approaches or something goes wrong, all while maintaining weapons discipline and proper communication with the chain of command. This is the reference that directly addresses how guard duty is conducted on a day-to-day basis.

The other references aren’t focused on those guard-post procedures. One covers Army command policy and the standards for leadership and discipline, not the step-by-step duties of a sentry. Another is about tactics and combat procedures more broadly, not the specific guard-duty post and relief routines. The remaining option isn’t the manual that lays out guard-post responsibilities either. So FM 22-6 is the source that provides the concrete, applicable guidance for guard duty.