During this period he also wrote two books, both of which were memoirs of his professional life combined with discussions of history and policy. One was titled "Honorable Men: My Life in the CIA"; the other, on Vietnam and his long involvement with American policy there, was called "Lost Victory". In the latter book, Colby argued that the U.S.–RVN counterinsurgency campaign in Vietnam had succeeded by the early 1970s and that South Vietnam could have survived had the U.S. continued to provide support after the Paris Accords. Though the topic remains open and controversial, some recent scholarship, including by Lewis "Bob" Sorley, supports Colby's arguments.