Secretary of Defense Donald H. Rumsfeld (center) responds to a reporter's question during a press conference at NATO headquarters in Brussels, Belgium, on Dec. 2, 2003. U.S. Ambassador to NATO R. Nicholas Burns (left) and Vice Chairman of the Joint Chiefs of Staff Gen. Peter Pace (right), U.S. Marine Corps, joined Rumsfeld as he updated the press on the progress of the meetings. Rumsfeld is at NATO headquarters for a two-day meeting of allied defense ministers to discuss expanding NATO's mission.