My brother, our family friend Brian Mckeon, and I ran the Hero Rush last weekend in Charlotte, NC. This particular race was special - it was dedicated to the families of the lost firefighters of 9/11. It wasn't really a mud run, but more of just an obstacle run (designed by actual firefighters.) ...and my god, it was tough. Fun though!
The “343″ wave is dedicated to the firefighters lost on 9/11. Each runner wears a commemorative racer’s bib showing the name of one of these fallen heroes. The wave is an additional $10, which will be matched by Hero Rush and donated entirely to the National Fallen Firefighters Foundation.
Definitely check out their site and look for 2013 runs (and discounts!)