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Originally Posted by LoBlo
Currently SSN defense against ASW aircraft threats aren't multilayered at all. There exist one, and only one option. If that fails there are no alternatives. Employing a system to provide last ditch alternatives to a 2billion dollar platform is not a bad thing if the option avails itself. Especially if all the hardware required already exist.
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The concept of a multilayered defense is designed around the quality of the layers. The idea is that one layer is unable to stop an acceptable fraction of incomming attacks. From what I can tell, most US submariners are pretty happy with the quality of their one layer, though.