Sector Defence Cloak

This is just copied from the sector defense topic.

Basically, cloak makes it harder for an attacker to see your SD or to know how many there are. But that's not as important. What's important is that when they attack, higher cloak decreases the number of you fighters they can take out. If they can't see 'em, they can't kill 'em.

Also, remember that only the highest cloak tech does anything, so don't upgrade cloak on multiple planets.

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