Copyright 2017 NPR. To see more, visit ROBERT SIEGEL, HOST: President Trump is promising a concerted effort to destroy ISIS. And today, the president spoke to service members at the center of that fight when he visited MacDill Air Force Base, home to the U.S. Central Command in Florida. (SOUNDBITE OF ARCHIVED RECORDING) PRESIDENT DONALD TRUMP: To these forces of death and destruction, America and its allies will defeat you. We will defeat them. We will defeat radical Islamic terrorism, and we will not allow it to take root in our country. SIEGEL: Trump also thanked representatives of the international coalition battling the Islamic State, and he had lunch with enlisted troops. NPR's Scott Horsley traveled with the president to Florida, and he joins us from Joint Base Andrews, just outside Washington, now. Scott, MacDill is home to Central Command, which oversees military operations in the Middle East. What was the president's message there today? SCOTT HORSLEY, BYLINE: Robert, the