Most people don't care, don't use it, but I do, a lot... Basically, whenever someone back caps the region where u are, the !Mission changes to "defend X". It's incredibly useful to get that little notification in real time and not have to constantly check the map. Since last patch though, its laggy as hell. I'll be in one base, it says "capture that base", so I go to A point, can't cap it, but it still says "capture A". See what I mean?