Belgian light brigade soldiers participate in a cross-border military exercise in Granfenwohr, Germany, April 2, 2013. The military exercise, starting from March 25, will last until April 4. (Xinhua/Wang Xiaojun)

Belgian light brigade soldiers participate in a cross-border military exercise in Granfenwohr, Germany, April 2, 2013. The military exercise, starting from March 25, will last until April 4. (Xinhua/Wang Xiaojun)

Belgian light brigade soldiers participate in a cross-border military exercise in Granfenwohr, Germany, April 2, 2013. The military exercise, starting from March 25, will last until April 4. (Xinhua/Wang Xiaojun)

Belgian light brigade soldiers participate in a cross-border military exercise in Granfenwohr, Germany, April 2, 2013. The military exercise, starting from March 25, will last until April 4. (Xinhua/Wang Xiaojun)

Belgian Major General Hubert de Vos (L) and Lieutenant General Donald M. Campbell, commanding general of U.S. Army Europe, participate in a cross-border military exercise in Granfenwohr, Germany, April 2, 2013. The military exercise, starting from March 25, will last until April 4. (Xinhua/Wang Xiaojun)