Sheehan eventually completed the book, A Bright Shining Lie: John Paul Vann and America in Vietnam (1988, published by Random House and edited by Robert Loomis).
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Described in Neil Sheehan's The Pentagon Papers as "private", "public-service", and "anti-communist", ECC provided personnel to Vietnam and Laos in capacities that served paramilitary ends, if not actually paramilitary in and of themselves.
Neil Sheehan wrote a Pulitzer Prize-winning Vietnam history and biography of Vann, A Bright Shining Lie: John Paul Vann and America in Vietnam, in which Sheehan examines Vann's alleged career-stunting incident involving a morals charge during his service in West Germany and how this possibly affected Vann's future actions and resulting career path in Vietnam.
In private practice, he was known for his 1971 defense of New York Times reporter Neil Sheehan for his role in the publication of the Pentagon Papers, and for his 1973 suit against Richard Nixon's reelection committee on behalf of Common Cause.