re not used by units smaller than a regiment, except
when such unit is independent or detached from its regiment. (41)

Whistle Signals

=91. Attention to orders.= A =short blast= of the whistle. This signal
is used on the march or in combat when necessary to fix the attention
of troops, or of their commanders or leaders, preparatory to giving
commands, orders, or signals.

When the firing line is firing, each squad leader suspends firing and
fixes his attention at a =short blast= of his platoon leader's
whistle. The platoon leader's subsequent commands or signals are
repeated and enforced by the squad leader. If a squad leader's
attention is attracted by a whistle other than that of his platoon
leader, or if there are no orders or commands to convey to his squad,
he resumes firing at once.

=Suspend firing.= A =long blast= of the whistle. All other whistle
signals are prohibited. (42)

Arm Signals

=92.= The following arm signals are prescribed. In making signals
either arm may be used. Officers who receive signals on the firing
line "repeat back" at once to prevent misunderstanding.

[Illustration]

=Forward, MARCH.= Carry the hand to the shoulder; straighten and hold
the arm horizontally, thrusting it in the direction of march.

This signal is also used to execute quick time from double time.

[Illustration]

=Halt.= Carry the hand to the shoulder; thrust the hand upward and
hold the arm vertically.

=Double time, MARCH.= Carry the hand to the shoulder; rapidly thrust
the hand upward the full extent of the arm several times.

[Illustration]

=Squads right, MARCH.= Raise the arm laterally until horizontal; carry
it to a vertical position above the head and swing it several times
between the vertical and horizontal positions.

[Illustration]

=Squads left, MARCH.= Raise the arm laterally until horizontal; carry
it downward to the side and swing it several times between the
downward and horizontal positions.

[Illustration]

=Squads right about, MARCH= (if in close order) or, =To the rear,
MARCH= (if in skirmish line). Extend the arm vertically above the
head; carry it laterally downward to the side and swing it several
times between the vertical and downward positions.

[Illustration]

=Change direction or Column right (left), MARCH.= The hand on the side
toward which the change of direction is to be made is carried across
the body to the opposite shoulder, forearm horizontal; then swing