Originally published in 2006, this volume from the History Office of the Office of the Secretary of Defense provides a narrative history and assessment of the early years of Robert McNamara's tenure as Secretary of Defense, including McNamara's relationship with Presidents Kennedy and Johnson, the transformation of the Department of Defense as a part of Kennedy's New Frontier, and the Pentagon's handling of the Cuban Missile Crisis, Bay of Pigs episode, and onset of the Vietnam War along with other major national security events and developments during a turbulent and momentous period of the Cold War.