Quote:
Originally Posted by Wdll
What exactly are they?
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It is a game abstraction which covers real world systems like this:
http://fofanov.armor.kiev.ua/Tanks/EQP/shtora.html
Actual usefulness in real life may vary; I would suspect that for example the one in the link would work well against older TOWs, but will do very little against a Javelin. So you can see why not everyone would bother with them in real life.
The russians in particular pioneered jammers and active defenses, probably as a part of an effort to contain tanks weights and reducing the strain on the logistical system.