The reason you get clicked by arty, with an illustration

The_Chieftain:   Probably the guy who's pushing, if there's nobody better. What's your point? You don't put yourself in the vanguard and not expect to receive damage, it's an activity which tends to attract attention. It helps to bring friends. But if I see there's a guy doing the assault, and a guy overwatching, I'm going for the guy overwatching pretty much every time.