President-elect Trump has made his pick for the top U.S. security position. Retired Gen. John Kelly to lead the Department of Homeland Security. Kelly served over 40 years in the Marine Corps. As head of the U.S. Southern Command he gained experience managing security threats posed by criminal networks close to home. "Unless confronted by an immediate, visible or uncomfortable crisis, our nation’s tendency is to take the security of the Western Hemisphere for granted. I believe this is a mistake."