All-around defense and perimeter defense are synonyms for one category of the (relative) positioning of defensive fighting positions that are supposed to give military units and sub-units the ability "to repel an attack from any direction by being organized or sited for all round defence". This defense can be used by military units from squad up.[citation needed] This defense is adopted so that the unit is capable of observing all ground and directing fire onto the observed ground.[citation needed]
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