I think it would be a great idea for ED and 3rd party devs (or someone could make a mod) to make Las Vegas PD and SWAT skins for some vehicles and helis, or at least he Huey, for the Nevada map. With such a large, bustling city on the map, I think it would be fun to create some police type missions for the helicopters. The Mi-8 might look a little out of place, but the Huey and future Gazelle would fit perfect.
Examples Of missions: helicopter coverage of high speed nighttime car chase (using spotlight to track). Or SWAT team fast rope insertion and extraction by helicopter.