Pledging to make public service a hallmark of her would-be administration, Democrat Hillary Clinton proposed Friday a 5 million-member “national service reserve” project that would train Americans to respond to natural disasters, health emergencies and other crises. The program, Mrs. Clinton said, would allow citizens to continue working in their full-time jobs but essentially would put them on call if state or local governments need more bodies. “If you join the national service reserve, you will receive some basic training, just like you would in the military reserves. And then when your city or state needs you, you’ll get the...