FM 17-35 ( Armored Cavalry Platoon, Troop and Squadron ) 1960

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(3) Personnel must not become vehicle-bound. They should
dismount in order to improve observation, to prevent
enemy detection, and to provide security.
(4) The distance of each bound is determined by the nature
of the terrain and the range at which the covering element
can effectively support the moving element. Normally,
this distance should not exceed the effective range
of small arms fire.
(5) Movement in each bound must be completed rapidly;
however, it should not be done so rapidly that efficiency
of operation and coordination between elements are lost.
(6) When covering elements have been signaled forward,
they should take the shortest and fastest route forward
to avoid delaying the continuation of movement.
(7) Movement is oriented on the enemy, the main body, or
terrain features as directed by the platoon leader.
(8) When the movement of advancing vehicles is being covered,
observation must be directed at terrain from which
fire is expected and not on the moving vehicles. By doing
this, the crews of the supporting vehicles are usually able
to detect the enemy or hostile fire more easily.
d. Dismounted Action. When a squad, section, or platoon moves
dismounted, it should apply the principles described in FM 17-20
and FM 21-75. All scout personnel must be skilled in map reading
and able to maintain direction of movement during all conditions
of visibility and terrain.
22. Successive and Alternate Bounds
Vehicles within the scout squad, scout squads within the section,
or sections within the platoon may advance employing either
successive or alternate bounds.
a. Successive Bounds (fig. 4). In this method, the leading element,
covered by the rear element, advances and takes up positions
to support the advance of the rear element. The rear element,
upon arriving at a position abreast of the leading element,
halts and again supports the advance of the leading element. Only
one element moves at any one time.
b. Alternate Bounds (fig. 5). In this method, the leading element
halts and takes up positions to support the advance of the
rear element, which then advances past the leading element and
takes up positions. The initial leading element then "leapfrogs"
the initial rear element and advances to a new position. Only one
element moves at any one time. This method of movement is usually
more rapid than successive bounds.
16 AGO 4088B