WASHINGTON, Oct. 25 -- The U.S. Department of Defense issued the following news: By Claudette Roulo Former Defense Secretary Ash Carter died yesterday at age 68 after a sudden cardiac event, according to a statement from his family. Carter "devoted his professional life to the national security of the United States and teaching students about international affairs," the statement said. Though trained as a theoretical physicist, Carter's DOD career was marked by a focus on the tangible, with more PR