It was signed by several future members of the Bush national security team: Donald H. Rumsfeld, who served as defense secretary; Paul D. Wolfowitz, who served under Mr. Rumsfeld; Mr. Abrams; and outsider advisers, including Richard N. Perle, a former chairman of the Defense Policy Board Advisory Committee; and Mr. Armitage. Serving as a research associate was Michael Goldfarb, who is helping to direct the Emergency Committee for Israel’s attacks against Mr. Hagel.