1. A system for prioritizing detected targets for countermeasure system engagement from a helicopter, said system comprising: means for determining at least two threat lethality factors for more than one threat to the helicopter from existing helicopter navigation and sensor data; means for determining a lethality value for each of said more than one threat to the helicopter by combining said at least two lethality factors in a mathematical function; means for comparing said lethality value for each of said more than one threat to the helicopter; means for determining a target engagement priority sequence for a helicopter installed countermeasure system from comparing said lethality value for each of said more than one threat to the helicopter; means for transmitting said target engagement priority sequence to said helicopter installed countermeasure system; and means for commanding said helicopter installed countermeasure system to engage said more than one threat to the helicopter using said target engagement priority sequence.