It could be nice if there were DCA in somes bases (Like radio tower) to avoid players to sneak in and throw a shelling before having destroyed the DCA.

May I ask what DCA is? Or at least it is missing even here: https://en.wikipedia.org/wiki/DCA
Anyway, I think the existing AA is very close to that DCA(whatever it is).

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"Ad cogitandum et agendum homo natus es"

I work quickly, cheaply and qualitatively. You can choose only two of the three options.

Sorry I may have used an other word, I meant anti aircrafts turrets.