Wake up and smell the roses! Get over it. If you have a CI, there isn't a chance for a snowball in a very hot place for you to get one of these jobs. There are many others you can do instead. The reasons you won't get one of these is very, very simple...these jobs require a complicated interaction between sight and hearing to even have a chance to be successful. There are many "normal" sighted and hearing people who can't do these jobs. Having one CI isn't going to do it and having two isn't a whole lot better and in either case you have that against you.
First of all, what are you going to do when your batteries decide to die on you and you are in the middle of a firefight. You can't say "timeout" let me change my batteries. So, now your batteries are dead and you can't hear and you hope that you can change them quickly. Unfortunately, at the time you were changing them (so being deaf for the moment), the radio blurted "get out of there ASAP" as things are deterioating all around you. There you are all alone and in a very dangerous situation and the possibility exist that you will not make it. You just created a problem for yourself and your team as they have to assist you all because your "bionic ear" either conked out or was knocked off somehow (Vampyrox). Heck, it could even be that a bullet gazed your head where your implant is and either damaged or destroyed it. Helmets don't always protect you from this problem.
Second of all, let's say your CI is functioning and it fine during this firefight. Well, with one CI, you can't tell direction of sound and that makes you a liability as it is absolutely critical that you know where sounds are coming from. While having two CI can assist there, it is still not quite as good as two good ears. Have a CI(s) doesn't give you normal hearing as there are sounds you need to hear but are two low for you to hear. I know this for a fact as I have a CI. Normal hearing people can hear the thunder at a great distance whereas I can't hear it until it is a little closer.
That brings up another thing...during action like this, it is often very loud. Have you ever tried to understand somebody talking over all that racket? It is bad enough for normal hearing people but it is really that much harder using a CI. You miss something important and your effective is compromised big time.
Now, I'm very surprised that the fire department allowed you to join them. More power to you! IMHO, I believe there may be situations that you will find out the hard way that "hey" normal hearing would be a nice thing at the time.
I'm a realist and I know my limits and I accept them in the context of jobs that may require normal (often superb) sight/hearing interaction. There is no way one can "substitute" this by being a quick thinker on one's feet. The one who survives is the one who has this advantage.
