WHISTLE SIGNALS.

42. 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.

ARM SIGNALS.

43. 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.

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

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

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.

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.

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.

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.

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 in a horizontal plane, arm extended, pointing in the
new direction.

AS SKIRMISHERS, MARCH. Raise both arms laterally until horizontal.

AS SKIRMISHERS, GUIDE CENTER, MARCH. Raise both arms laterally
until horizontal; swing both simultaneously upward until