At a recent full scale exercise I was the fire controller and an old acquaintenance of my was the evaluator. This was an IED type exercise at a school football game. Initial response was from the Twp. PD who did an excellent job of taping off the area and controlling the scene. The fire department arrived on the scene with a command vehicle, turned on the big green light and never stepped foot in it again. It was hard to watch an incident like this because the safety of responders was in jeopardy all of the time. Although there was an accountability officer, only about half of the responders had tags, consequently it was never clear who was where.
This brings up a huge problem in a mutual aid situation. When you call a mutual aid company for mutual aid, their well being is placed in your hands. But beyond that what that mutual aid company does has an affect on your people. Most areas have a county chiefs association at the very least, take a stand on accountability and Rapid Intervention Teams as well as personal accountability.
While writing the after action report, I did a little research on accountability. I found one piece of software, I'm sure that there are more, that I thought was pretty slick. It's called In Site Accountability System and is presented by Vernon Software. It's very user friendly and compatible with PASS devices. It is also very user definable and easy to use. The developer was very helpful also. Look it up at Vernon Software Systems. I know I mentioned it before,but I think it's good.
But, beyond that, if nothing else, get a legal tablet and keep track of your people, it's not a big city thing.