The new commandant of the Marine Corps today presented a vision of the service focused far more on light-on-their-feet Marines fighting in small wars than on full-scale combat. Gen. James Amos, who officially took the helm of the service last month, told an auditorium full of Marines at Quantico that he sees the service as a flexible “middleweight” force that can respond quickly to diverse situations ranging from humanitarian intervention to full-scale combat, which could include major theater war but...