 Welcome back to our special July 4th edition, The Best of the Federal Drive, with Tom Tannen here on Federal News Network. Lots of people, even those who should know better, often misconstrue the fundamental purpose of the U.S. military. Our next guest has written a provocative essay on the subject of deterrence. At a time when not much in the world seems deterred, Melanie Sisson is a fellow at the Brookings Foreign Policy Program. She joined me earlier with more.