War of Numbers: An Intelligence Memoir of the Vietnam War's Uncounted Enemy;

Sam Adams loved intelligence work, and that enthusiasm shines throughout this memoir of his years with the Central Intelligence Agency. His career was dominated by an epic struggle over Vietnam -- over military attempts to hide the true size of the enemy forces there, and over the integrity of the intelligence process. Adams's insistence on telling the truth caused an ungodly ruckus in both Washington and Saigon at the time, and years later, after the CIA had threatened to fire him (on thirteen occasions!) and he had quit the agency in disgust, Adams brought his story back up to the surface more loudly than ever in a CBS television documentary which eventually resulted in a notorious trial on libel charges brought by General William Westmoreland.
After leaving the CIA, Adams sat down to write an account of his life at the agency. There is nothing else quite like the story he tells.