A two-person zero-sum game is used to model the mobile defense problem in order to examine, in the context of terminal ballistic missile defense, the advantages that accrue to the defender from being able to deny the attacker knowledge of the defense deployment. The marginal exchange ratio is shown to be quite favorable to the defender using mobile interceptors if the fraction of the target system that he wishes to protect is small. A combination of mobile defense and deceptive basing appears to be an extremely attractive defense option, since the mobile defense raises the price the attacker must pay to destroy a single target, while the deceptive basing increases the number of targets at which he must pay that price.
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