eping 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.