I like umbrellas -- mostly because getting raindrops in my eyes irritates the hell out of me (and ballcaps just don't cut it for me over a 3-mile walk), and because I'm a lifelong wearer of glasses, so I have a reflex that tells me rain will splotch and steam my glasses, even though I've switched to contacts.

Still, it's hard to picture a person in uniform with an umbrella. It would look odd to me! Which is interesting, because I've never thought about it.