ICS has been around the fire service...sort of from the beginning.  That said, for municipal departments, it's important to remember that we need to learn and utilize the principles and tools within the Incident Command System to ensure that we're all still doing the right things...the right way.  We've heard the, "I'll be Branch Two" at a structure fire...unless you've got three-to-seven-with-optimal-being-five engines...then strike teams, then divisions...and so forth...we probably don't need branches.  Practice the way you play...so that you can integrate everyone else when the big show comes as a home game.