The ES/A-9r Electronic Support and Attack Measure Suite is a sensor and electronic countermeasure suite that detects active sensor and communications emissions from hostile assets, including ships and missiles. The electronic attack component of the package can be used to jam both types of signals, and in some cases can overload the hostile transceiver.

It is used on various Systems Commonwealth ships, such as the Glorious Heritage Class vessel Andromeda Ascendant.

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