Stealth aircraft and ships are a response to radar and sonar; they make the targets hard to find. Electronic counter-warfare (ECW) kicks it up a notch: ECW systems actively fool radar or sonar, either by jamming them so they can't receive a signal, or by deliberately tricking them into thinking their target is somewhere it isn't.
Evolution produced all of these defenses (against the echo-location, or sonar, of bats) long before humans ever did so...
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