5. Each restaurant features some of the local firehouse history
You can catch the firefighter influences at the sub chain through their sandwich names (Hook & Ladder, The Engineer) and their signature style ("fully involved" -- which means a serious fire in industry speak -- gets you mayo, deli mustard, lettuce, tomato, onion, and a kosher dill pickle on the side). But they also get local fire chapters involved in every outpost. Each spot gets a custom mural, and the local departments can pitch in whatever representation they like, ranging from old archived photos of the team in action to retired captains' leather helmets.