Anti-ballistic missile defense countermeasure

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Anti-ballistic missile defense countermeasures are tactical or strategic actions taken by an attacker to overwhelm, destroy, or evade anti-ballistic missile defenses.^[1]

Anti-ballistic missile (ABM) defense countermeasures can be categorized in a variety of ways, such as whether something is attacked or just confounded (i.e., whether the defender is attacked, whether the defender's ABM defense is attacked, or whether the defenders ABM system is confounded). They can be categorized by the type of ABM system they are to operate against. Finally, they can be categorized by which part of a ballistic missile's flight they are active (boost, bus, midcourse, or terminal phases).