The training is always a plus! Devildoc is right, 99.9% of the time you are a recovery diver. In our waterways we have a heavy sediment content in the water. The most visibility we have on a good day is 0 to 1 foot in the lake depending on the depth your at. So most of our dives are blackout dives. So when you are doing a "recovery" it gets interesting when you run into the victim when you can't see them. Our lake was formed when The Tennessee Valley Authority flooded the area so we run into things like barb wire fences, foundations from old houses and other items that were left in the area. One of my suggestions is practice taking of your gear with a blackout mask on so you are comfortable removing your equipment under water during those situations. When I dive I have a pair of wire cutters just in case. I started out as a shore technician and worked my way up to diver. I enjoy it. I like doing the underwater evidence recovery. It's kinda like a high stakes game of hide and seek. When it comes to finding evidence that is thrown into the water. Take all the training you can, and dive as much as you can to build up your confidence. If you can, go to areas that the dive team has been called to and get a feel for the area while diving. But like Doc said make sure you have a dive buddy. If you ever have questions just give a shout! Good luck!
