To achieve maximum accuracy and effective fire, a machine gun must be employed using direct lay.
However, at times the tactical situation may make it desirable to employ a machine gun from a defilade position. A defilade position is one in which the gun and crew are hidden from enemy observation by an intervening land mass called a mask. A position offers partial defilade when the mask offers some protection against direct fire but the gunner can engage targets using direct lay. Partial defilade positions are desirable when the mission cannot be accomplished from a defilade position. See figure 6-41.
The physical factors that effect the ability to bring fire to bear on a target from a defilade position are the range to the target, the trajectory of the round, and the height of the mask between the gun and target. The MK-19, with its relatively high trajectory,
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