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Gaston Joseph Sigur Jr. (pronounced Seeg-YOOR; November 13, 1924 – April 26, 1995)  was the United States Assistant Secretary of State for East Asian and Pacific Affairs from 1986 to 1989.
Sigur was questioned extensively by joint Congressional committees (Congressional Committees Investigating The Iran-Contra Affair) for his knowledge relating to the Iran-Contra affair. Members of Congress examined his interactions with Colonel Oliver North and other individuals who were named as being interested in providing financial assistance to the Nicaraguan contras. Although Sigur did engage his contacts (e.g. Taiwan) as requested by other Reagan Administration officials, he was not aware of any illicit activities between the United States government and the contras, nor did he comply with the illegal transfer of money to the contras.
Following graduation from the Naval Academy in 1959, McFarlane was commissioned a second lieutenant in the Marine Corps, where he served as a field artillery officer.
As a Marine Corps officer, McFarlane commanded platoons, a battery of field artillery howitzers and was the Operations Officer for an artillery regiment. He taught Gunnery at the Army Advanced Artillery Course. He was the executive assistant to the Marine Corps’ Operations Deputy from 1968–1971, preparing the deputy for meetings with the Joint Chiefs of Staff. During this assignment he was also the Action Officer in the Marine Corps Operations Division for Europe/NATO, the Middle East and Latin America.
McFarlane served two combat tours in the Vietnam War. In March 1965, he commanded the artillery battery in the first landing of U.S. combat forces in Vietnam. While deployed during his first tour, McFarlane was selected for graduate studies as an Olmsted Scholar. McFarlane received a master’s degree (License) in strategic studies with highest honors from the Graduate Institute of International Studies (Institut de Hautes Etudes Internationales, HEI) in Geneva, Switzerland.
After attending the Graduate Institute of International Studies, McFarlane returned for a second tour in 1967–1968 as a Regimental Fire Support Coordinator for the 3rd Marine Division deployed along the Vietnamese Demilitarized Zone during the Tet Offensive. He organized all fire support (B-52s, naval gunfire from the USS New Jersey (BB-62) and artillery) for forces deployed at Con Thien, Cam Lo, Dong Ha, The Rockpile, Khe Sanh and points between. McFarlane received a Bronze Star and a Navy Commendation Medal, both with Valor device.
Following his second tour in Vietnam and a tour at Headquarters Marine Corps, in 1971 he was named a White House Fellow. He was the first Marine Corps officer selected for the program.
McFarlane was assigned to the Office of Legislative Affairs at the White House and at the conclusion of that assignment was selected as the Military Assistant to Henry Kissinger at the National Security Council. In this post, McFarlane dealt with intelligence exchanges with the People’s Republic of China from 1973 to 1976, giving detailed intelligence briefings to China at the time of the Sino-Soviet split. He also accompanied Kissinger on his visits to China. In addition, McFarlane dealt with other aspects of foreign policy, including the Middle East, relations with the Soviet Union and arms control. McFarlane was appointed by President Gerald Ford as his Special Assistant for National Security Affairs while a Lieutenant Colonel and was awarded the Navy Distinguished Service Medal in 1976.
Upon leaving the White House, McFarlane was assigned to the National Defense University, where he co-authored a book on crisis management while concurrently receiving a diploma from the National War College.
He ended his Marine Corps career on Okinawa as Operations Officer for the 12th Marine Regiment. McFarlane retired in 1979 with the rank of lieutenant colonel.
McFarlane co-founded and served as CEO of McFarlane Associates Inc., an international consulting company.
McFarlane is a member of the Washington Institute for Near East Policy (WINEP) Board of Advisors, is president of the Institute for the Analysis of Global Security, is on the Board of Advisors and is a founding member of the Set America Free Coalition. He is also an Advisory Board member for the Partnership for a Secure America, a not-for-profit organization dedicated to recreating the bipartisan center in American national security and foreign policy.