The vice chairman of the Joint Chiefs of Staff today downplayed a second consecutive test failure of the Pentagon's ballistic missile defense system, stating that the United States has enough interceptors in the field to protect itself against threats. “I'm not the least bit concerned that we don't have a capability to defeat, should we need to, that rogue threat that the system's been designed against,” Gen. James Cartwright said during a news conference today. “We have more than enough...