I carry a Smith and Wesson First Responder 911 knife.
You can find them a lot cheaper on ebay but there is a picture of one.
My whole department loved mine except one guy who didn't like the open blade for a seat belt cutter but you would really have to work to cut someone with it. Not saying you couldn't it just wouldn't be unintentional.
Well, if crime fighters fight crime and fire fighters fight fire, what do freedom fighters fight? They never mention that part to us, do they?