The Gulf of Tonkin (Vietnamese: Vịnh Bắc Bộ, simplified Chinese: 北部湾; traditional Chinese: 北部灣; pinyin: Běibù Wān) is a body of water located off of northern Vietnam and southern China. It is a northern arm of the South China Sea. The Gulf is defined in the west by the northern coastline of Vietnam, in the north by China's Guangxi province, and to the east by China's Leizhou Peninsula and Hainan Island.

The bay's Vietnamese and Chinese names – Vịnh Bắc Bộ and Běibù Wān, respectively – both mean "Northern Bay". The name Tonkin, written "東京" in Hán tự characters and Đông Kinh in romanised Vietnamese, means "Eastern Capital", and is the former toponym for Hanoi, the present capital of Vietnam. Incidentally, the same Chinese characters – known as kanji when used in Japanese – are used to write "Tokyo"; "Gulf of Tonkin" is written identically to "Tokyo Bay" (東京灣/湾) in Japanese.

On 4 August 1964, United States President Lyndon B. Johnson erroneously claimed that North Vietnamese forces had twice attacked American destroyers in the Gulf of Tonkin. Known today as the Gulf of Tonkin Incident, this event spawned the Gulf of Tonkin Resolution of 7 August 1964, ultimately leading to open war between North Vietnam and the United States. It furthermore foreshadowed the major escalation of the Vietnam War in South Vietnam, which began with the landing of US regular combat troops at Da Nang in 1965.

Robert Strange McNamara (June 9, 1916 – July 6, 2009) was an American business executive and the eighth Secretary of Defense, serving under Presidents John F. Kennedy and Lyndon B. Johnson from 1961 to 1968, during which time he played a large role in escalating the United States involvement in the Vietnam War. Following that, he served as President of the World Bank from 1968 to 1981. McNamara was responsible for the institution of systems analysis in public policy, which developed into the discipline known today as policy analysis.

Prior to public service, McNamara was one of the "Whiz Kids" who helped rebuild Ford Motor Company after World War II, and briefly served as Ford's President before becoming Secretary of Defense.

Robert McNamara was born in San Francisco, California. His father was Robert James McNamara, sales manager of a wholesale shoe company. His mother was Clara Nell Strange McNamara. His father's family was Irish and in about 1850, following the Great Irish Famine, had emigrated to Massachusetts and later to California. He graduated from Piedmont High School in Piedmont, California in 1933 where he was president of the Rigma Lions boys club and earned the rank of Eagle Scout. He graduated from the University of California, Berkeley in 1937 with a Bachelor of Arts degree in economics with minors in mathematics and philosophy. He was a member of Phi Gamma Delta fraternity, was elected to Phi Beta Kappa his sophomore year and earned a varsity letter in crew. He was also a member of the UC Berkeley's Order of the Golden Bear which was a fellowship of students and leading faculty members formed to promote leadership within the student body. He earned an MBA from Harvard Business School in 1939.

Ronald Ernest "Ron" Paul (born August 20, 1935) is an American politician who has been the U.S. Representative for Texas's 14th congressional district, which includes Galveston, since 1997, and a three-time candidate for President of the United States, as a Libertarian in 1988 and as a Republican in 2008 and currently 2012. He is an outspoken critic of American foreign and monetary policies, including the Military–industrial complex and the Federal Reserve, and is known for his libertarian-leaning views, often differing from his own party on certain issues.

A native of Pittsburgh, Pennsylvania, Paul is a graduate of Gettysburg College and Duke University School of Medicine, where he earned his medical degree. He served as a medical officer in the United States Air Force from 1963 until 1968. He worked as an obstetrician-gynecologist from the 1960s to the 1980s, delivering more than 4,000 babies. He became the first Representative in history to serve concurrently with a child in the Senate when his son Rand Paul was elected to the United States Senate for Kentucky in 2010.