the march they take the form of advance guards, rear guards,
and flank guards. At a halt they consist of outposts.

3. Interior guards are used in camp or garrison to preserve order,
protect property, and to enforce police regulations. In time
of war such sentinels of an interior guard as may be necessary
are placed close in or about a camp, and normally there is an
exterior guard further out consisting of outposts. In time of
peace the interior guard is the only guard in a camp or garrison.

4. Military police differ somewhat from either of these classes.
(See Field Service Regulations.) They are used in time of war
to guard prisoners, to arrest stragglers and deserters, and to
maintain order and enforce police regulations in the rear of
armies, along lines of communication, and in the vicinity of large
camps.

5. Provost guards are used in the absence of military police,
generally in conjunction with the civil authorities at or near
large posts or encampments, to preserve order among soldiers
beyond the interior guard.

SECTION 2. CLASSIFICATION OF INTERIOR GUARDS.

6. The various elements of an interior guard classified according
to their particular purpose and the manner in which they perform
their duties are as follows:

(a) The main guard.

(b) Special guards: Stable guards, park guards, prisoner
guards, herd guards, train guards, boat guards, watchmen, etc.

SECTION 3. DETAILS AND ROSTERS.

7. At every military post, and in every regiment or separate
command in the field, an interior guard will be detailed and duly
mounted.

It will consist of such number of officers and enlisted men as
the commanding officer may deem necessary, and will be commanded
by the senior officer or noncommissioned officer therewith, under
the supervision of the officer of the day or other officer detailed
by the commanding officer.

8. The system of sentinels on fixed posts is of value in discipline
and training because of the direct individual responsibility
which is imposed and required to be discharged in a definite
and precise manner. While the desirability of this type of duty
is recognized, it should only be put in practice to an extent
sufficient to insure thorough instruction in this method of
performing guard duty and should not be the routine method of its
performance. The usual guard duty will be performed by watchmen,
patrols, or such method as, in the opinion of the commanding
officer, may best secure