Military officials applaud with North Korean leader Kim Jong Un, during the Unhasu concert in Pyongyang, in a photo released April 16, 2013. (KCNA)
A firefighter tries to extinguish a U.S. Marine helicopter after it made a "hard landing" during an exercise, north of Seoul, April 16, 2013.
South Korean soldiers participate in a search operation during their military drill in Daejeon, south of Seoul, April 16, 2013.
A North Korean soldier guards the entrance to Pyongyang's Kumsusan mausoleum, where the bodies of the late leaders Kim Il Sung and Kim Jong Il lie embalmed, April 15, 2013.