Which Training Circular (TC) covers Drill and Ceremony?

The correct answer is TC 3-21.5, which is specifically dedicated to the subject of Drill and Ceremony. This Training Circular provides comprehensive guidance and detailed instructions on the proper procedures and techniques involved in military drill and ceremony, including the importance of these activities for unit cohesion, discipline, and ceremonial functions. Understanding and mastering the content provided in TC 3-21.5 is essential for military personnel, as it ensures that they can execute drills with precision and maintain the standards expected in military operations and ceremonies.