Larry Armstrong has been volunteering with his local Boy Scout branch for years, chaperoning trips, serving on the council committee, even becoming certified in archery instruction for a day camp. But Armstrong, at 6-foot, 2-inches tall and about 370 pounds, may no longer qualify for some scout outings because he's overweight, part of a new push by the national organization to ensure the scouts and their volunteers are healthy. A new mandatory weight requirement by the national Boy Scouts of America that will take effect next January has some longtime volunteers concerned they will be left out of trips they've...