With thoughts of becoming a labor organizer, Ellsberg won a scholarship to Harvard University and graduated summa cum laude. He served in the Marines as an act of defiance against his Ivy League background, but eventually returned to Harvard and earned a doctorate in economics. In 1959, he became a strategic analyst at the Rand Corp., a global policy think tank based in Santa Monica, California, and consulted for the Defense Department and the White House on nuclear weapons, nuclear war plans and crisis decision-making. Ellsberg spent two years in the mid-1960s with the State Department in Vietnam, where he learned first-hand how casually military and political officials lied and became convinced the conflict was unwinnable, in part through the firefights with the North Vietnamese that he survived.