NEW YORK -- The U.S. military needs to begin thinking about a future when the nation faces weapons from space -- a move that would require a policy shift by the U.S. government -- because it would be "folly" to think potential adversaries such as Russia and China are not exploring armed satellites, a senior Defense Department official said this week. Adm. Christopher Grady, vice chairman of the Joint Chiefs of Staff, floated the idea that U.S. military planners need...