Which FM would one refer to for guidance on proper drill and ceremony?

The correct answer focuses on FM 3-21.5, which specifically addresses drill and ceremony within the Army. This field manual provides detailed instructions and guidelines for conducting various formations, ceremonies, and movements that are integral to military operations and discipline. Understanding this manual is essential for leaders and soldiers alike, as it ensures proper execution of drill procedures, fostering unity, professionalism, and military bearing within formations.

The other choices refer to different aspects of Army operations. FM 4-25.11 deals with military first aid, FM 3-23.35 focuses on the training and use of individual weapons, and FM 6-22 appendix B offers information related to leadership. While these manuals are important, none of them provide the specific guidance on drill and ceremony that FM 3-21.5 does, making it the appropriate reference for this topic.