Protect personnel and equipment , Restrict freedom of movement, Control key terrain and Gain time are four general purposes of tactical defensive missions.
A tactical mission task is a particular action carried out by a unit while carrying out a certain tactical operation or maneuver. An effect on an enemy force or an action by friendly forces can both be used to describe a tactical mission task (FM 3-90-1).
Area defense, mobile defense, and retrograde are the three fundamental defensive functions. Both the tactical and operational levels of warfare are covered by these, albeit the operational level is most frequently linked with the mobile defense.
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The OPFOR recognizes what four general purposes of tactical defensive missions.
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