National Public Radio: SCOTT SIMON, host: John Jarvis is the new director of the nation’s park. He’ll be in a new role but not in unfamiliar territory. Mr. Jarvis started with the National Park Service more than three decades ago, handing out maps to tourists on the National Mall during bicentennial celebrations. He is a former park ranger who will now command a veritable army of park rangers. Mr. Jarvis joins us now from Oakland, California, where he’s packing up his office as director of the Park …