BOISE, Idaho — As Sean Peterson took his seat Friday morning in the nation’s nerve center for fighting wildfires, 104 large blazes raged uncontained across the US. The federal government’s firefighting resources were already fully committed, but requests from regional commands kept pouring in.  The day before, his office had turned away requests for 37 aircraft, 40 fire engines, and hundreds of specialists. Six hundred more requests had landed that morning. The Park Fire in Northern California was exploding at a pace that horrified and amazed even the hardened veterans here. A firefighter injured by a tree had been evacuated to an Idaho hospital. And an aircraft had gone missing overnight amid the smoke. …When all of the West is on fire at once, this is who deals with it. Peterson manages the 32 employees at the National Interagency Coordination Center, on a fenced-in federal government campus abutting the Boise Airport.