TC 3-21.5 governs Army-wide uniformity in the conduct of drill and ceremonies, including formations and precise movements.
View TC 3-21.5 on armypubs.army.mil
TC 3-21.5 covers drill instruction, teaching techniques, individual and unit drill, and the manual of arms for Infantry weapons. It also addresses military music, commands, formations, reviews, parades, funerals, colors, and other ceremonies.
Applies to: TC 3-21.5 applies to the Active Army, Army National Guard/Army National Guard of the United States and United State Army Reserve unless otherwise stated.
The purpose of drill is to enable commanders or noncommissioned officers (NCOs) to move their unit from one place to another in an orderly manner, to aid in disciplinary training by instilling habits of precision and response to the leaders orders, and to provide for the development of all Soldiers in the practice of commanding troops. (paragraph 9)
Route Step March is executed identically to At Ease March except that Soldiers may drink from their canteens and talk. (paragraph 4-21)
For the squad or platoon in March, except when supplementary commands need to be given, the interval of time is that which allows one step (or count) between the preparatory command and the command of execution. (paragraph 3-24)
For ceremonial firing, the firing party consists of not more than eight riflemen and not less than five riflemen with one NCOIC (see figure 14-10 on page 14-22). (paragraph 14-40)
Parade Rest with the Colors is executed with staffs vertical. (paragraph 15-35)