three were hurried when specialist ivan lopez opened fire before taking his own life. they said that lopez' struggle with depression and anxiety and after the shooting, president obama vowed to, quote, get to the bottom of exactly what happened. defense secretary chuck hagel will get to board china's new aircraft carrier during a trip to china this week. the u.s. defense officials says a tour was requested and china agreed to it. he'll be the first american to board a chinese aircraft carrier. his visit is significant as usa and china try to improve relations and it come to the heel of china participating in the multinational search for the missing malaysian airliner. teams searching for flight 370 are racing to confirm the pulse signals detected by a chinese ship. the latest and best lead. one that won't last long with the pingers of the black box dying. if they're not dead already. these signals may be the black