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The benchmark problem addresses the efficient allocation of an agile beam radar in the presence of highly maneuverable targets and radar electronic countermeasures (ECM). This paper presents methods for applying an interacting multiple model/multiple hypothesis tracking (IMM/MHT) tracker to this radar tracking and resource allocation problem. The manner in which IMM/MHT tracking and data association methods lead to efficient agile beam radar allocation is discussed and results showing that this approach is more efficient than previously proposed methods is presented. However, results indicate that the presence of ECM requires that the allocated signal-to-noise ratio (SNR) be increased and the allowable track position uncertainty be decreased from the values that would be chosen to minimize energy allocation when no ECM is present.