Eh, depends loh. I've worn one of those things, but they call it
a flak jacket and its damn heavy, can't run around in one of those.

But for my vocation as a VC of an armoured vehicle, it is SOP
during operations. I don't know why also, but its kind of ironic
when I go for range and one of my targets involved a super cute and
small tactical figure which alias is a VC target. 