During the period of U.S. combat involvement in the Vietnam War, there was considerable argument about progress among the DoD under Robert McNamara, the CIA, and, to some extent, the intelligence staff of Military Assistance Command Vietnam. More Stockwell: https://www.amazon.com/gp/search?ie=U...
In general, the military was consistently more optimistic than the CIA. Sam Adams, a junior CIA analyst with responsibilities for estimating the actual damage to the enemy, eventually resigned from the CIA, after expressing concern to Director of Central Intelligence Richard Helms with estimates that were changed for interagency and White House political reasons. Adams afterward wrote the book War of Numbers.
Things came to a head in the mid-1970s, around the time of Watergate. A dominant feature of political life during that period were the attempts of Congress to assert oversight of the U.S. Presidency and the executive branch of the U.S. government. Revelations about past CIA activities, such as assassinations and attempted assassinations of foreign leaders (most notably Fidel Castro and Rafael Trujillo) and illegal domestic spying on U.S. citizens, provided the opportunities to increase Congressional oversight of U.S. intelligence operations.[64]
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