This week I’m welcoming President Donald Trump to Pennsylvania for an unprecedented gathering. For the first time, the US defense industry will recognize that achieving the president’s goal of sustainable peace through strength demands new players and new ways of doing business.   And at the Defense and Innovation Summit at the US Army War College in Carlisle on Wednesday, Pennsylvania is showing the way. America’s adversaries, including China, Iran, Russia, North Korea and radical Islamists, share one objective: weakening the United States. They’re working together to that end. Iranian-designed Shahed drones, built inside Russia with Chinese components and North...