PATROL BASE DETROIT, Afghanistan – There’s limited electricity and no plumbing here, but you won’t hear much complaining from the Marines who call this tiny outpost home. Patrol Base Detroit sits on the western side of volatile Trek Nawa, a relatively lawless region just east of Helmand province’s Marjah district. Marines here engaged in frequent firefights here until mid-October, when it appears the frigid temperatures at night led to the annual end of Afghanistan’s unofficial fighting season. They’re certainly still on the lookout for insurgent activity, but it appears the peak point has passed. Photographer Colin Kelly and I arrived…