15.  Captains will supervise the keeping of company rosters and see that all duties performed are duly credited. (See pars. 355-364, A. R., for rules governing rosters, and Form 342, A. G. O., for instructions as to how rosters should be kept.)

16.  There will be an officer of the day with each guard, unless in the opinion of the commanding officer the guard is so small that his services are not needed.  In this case an officer will be detailed to supervise the command and instruction of the guard for such period as the commanding officer may direct.

17.  When more than one guard is required for a command, a field officer of the day will be detailed, who will receive his orders from the brigade or division commander, as the latter may direct.  When necessary captains may be placed on the roster for field officer of the day.

18.  The detail of officers of the guard will be limited to the necessities of the service and efficient instruction; inexperienced officers may be detailed as supernumerary officers of the guard for purposes of instruction.

19.  Officers serving on staff departments are, in the discretion of the commanding officer, exempt from guard duty.

20.  Guard details will, if practicable, be posted or published the day preceding the beginning of the tour, and officers notified personally by a written order at the same time.

21.  The strength of guards and the number of consecutive days for which an organization furnishes the guard will be so regulated as to insure privates of the main guard an interval of not less than five days between tours.

When this is not otherwise practicable, extra and special duty men will be detailed for night guard duty, still performing their daily duties.  When so detailed a roster will be kept by the adjutant showing the duty performed by them.

22.  The members of main guards and stable and park guards will habitually be relieved every 24 hours.  The length of the tour of enlisted men detailed as special guards, other than stable or park guards, will be so regulated as to permit of these men being held accountable for a strict performance of their duty.

23.  Should the officer of the day be notified that men are required to fill vacancies in the guard, he will cause them to be supplied from the organization to which the guard belongs.  If none are available in that organization, the adjutant will be notified and will cause them to be supplied from the organization that is next for guard. (Par. 68.)

24.  The adjutant will have posted on the bulletin board at his office all data needed by company commanders in making details from their companies.

At first sergeant’s call, first sergeants will go to headquarters and take from the bulletin board all data necessary for making the details required from their companies; these details will be made from their company rosters.