North Korea's new commander in chief, Kim Jong-un, waves as he walks ahead of Kim Yong-nam, president of the Presidium of the Supreme People's Assembly, after attending a concert to mark the 80th anniversary of the founding of the North Korean army, in Pyongyang, North Korea, on Wednesday, April 25, 2012. North Korea is armed with "powerful modern weapons" capable of defeating the United States, a top military chief in Pyongyang said Wednesday, a claim that matches the country's regular rhetoric but is questioned by experts. (AP Photo/Ng Han Guan)