Which technique is used for establishing a perimeter defense?

The technique of using a circular formation with overlapping fields of fire is particularly effective for establishing a perimeter defense because it maximizes the ability of the defending units to cover all angles of approach. In this configuration, personnel are positioned in such a way that their lines of fire intersect, creating a cohesive defense that minimizes blind spots. This is essential in a perimeter defense where threats can come from various directions.

The circular formation allows defenders to maintain situational awareness and provides a strategic advantage by ensuring that multiple weapons can engage an enemy target simultaneously, increasing the chances of a successful defense. This technique also facilitates mutual support among units, making it difficult for an attacking force to penetrate the perimeter without sustaining considerable fire.

In contrast, the other techniques mentioned do not provide the same level of cohesion or coverage. Fixed positions may offer strong defense in one direction but could leave flanks vulnerable, while a loose spread could compromise the ability to respond quickly to threats from unexpected angles. Random placement does not establish a structured defense, making it far less effective in responding to an organized enemy assault. Hence, using a circular formation with overlapping fields of fire is the superior approach for securing a perimeter.