Book excerpt: Author's note: Historians who walk through what the late President Kennedy called the "minefield" of contemporary events must tread carefully lest their own reputations, or those of perons about whom they write, be blown skyward by misstatement or misinterpretation. Truth is the First Casualty is a reconstruction of an event that will remain politically volatile for years; unsurprisingly therefore, the Johnson Adminsitration and its officials are anxious that as little as possible be said about it. ... Arlington, Virginia, April 16, 1969 [page 1].