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Radar Warning Receiver
The RWR is an electronic device that informs the pilot/crewman of an aircraft that it is being 'painted' by an active enemy weapons system - either radar-controlled AAA or missiles.
The warning consists of both visual and audible signals - usually a tone in the helmet/headset earpiece and a flashing red caption that reads YOU ARE GOING TO DIE!
This doesn't always work, as the Israelis found out when engaged by Syrian SA-6s during the Yom Kippur War in 1973.
