U.S. Defense Secretary Leon E. Panetta and U.S. Ambassador to NATO Ivo H. Daalder arrive at NATO headquarters in Brussels, April 18, 2012. Panetta is in Brussels to attend the ministerial conference with members of NATO as well as participating in meetings with Secretary of State Hillary Rodham Clinton. U.S. Defense Secretary Leon E. Panetta and U.S. Ambassador to NATO Ivo H. Daalder arrive at NATO headquarters in Brussels, April 18, 2012. Panetta is in Brussels to attend the ministerial conference with members of NATO as well as participating in meetings with Secretary of State Hillary Rodham Clinton. SHARE: Download: Full Size (3.67 MB) Tags: Photo Essays Credit: VIRIN: 742170-J-BTI27-703.jpg Photo Gallery