Screening (tactical)
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Screening is a military tactic in which a "screening force" (sometimes referred to as a "security force," or "guard force") provides early warning and reconnaissance to a main force or unit. Screening units are usually smaller and more mobile than units of the main body. They also detect and harass the enemy's own screening and reconnaissance units, hide the main body’s strength and location, and delay enemy advance. Screening forces generally avoid becoming decisively engaged.
Screening may be utilized in all warfare domains; on the ground, on the sea, in the air, in space, and in cyberspace.