Fought between 1956 and 1975 American involvement in the Vietnam War saw over two million US citizens serve and some 58,000 die or be declared missing in action. Michal Belknap in his study of the war cites that during the period August 1965 to October 1967 those who felt it was not a mistake to send troops to Vietnam fell from 61 percent to 44 percent, not to mention that by 1967 a total of seven people had set themselves alight in protest, and the antiwar movement had expanded to become a serious force within American social and political life, including not just students and professors but also members of the clergy and business executives.