Bulletproof vest as a parking enforcer?

I am a parking enforcement officer, working grave yard shifts in a bad neighborhood and i was considering buying a bulletproof vest to wear at night. What kind of bullet proof vest will be good and what level.

Thanks in advanced for the answers

What type of weapons permit do i need to be able to walk around with a sword? and how do i obtain one?

I live in a bad neighborhood and i need to get a weapons permit, one that will allow me to walk around with a sheathed sword(Not a concealed weapons permit). can anyone tell me what type of weapons permit i would need? and how i could obtain one?