The president's trip to Dover comes as he begins weighing whether to reshape U.S. military activities around the world. As a candidate, he vowed to be tougher on the Islamic State and at one point said he would be willing to send up to 30,000 U.S. troops to fight the extremist group in Iraq and Syria. Last week, Trump gave the Pentagon and other agencies 30 days to submit a plan for defeating the Islamic State.