Satellite imagery shows rocket at launch site in northeastern North Korea . North Korea says it will launch a commercial aircraft atop a rocket between April 4 - 8 . U.S. Defense Secretary Robert Gates says he aims to increase military capability . U.S. Navy ships capable of shooting down missiles moved to Sea of Japan .
Satellite imagery shows rocket at launch site in northeastern North Korea . North Korea says it will launch a commercial satellite atop a rocket between April 4-8 . U.S. Defense Secretary Robert Gates says rocket aims to boost military capability . U.S. Navy ships capable of shooting down missiles moved to Sea of Japan .