I never met Daniel Ellsberg. I vaguely remember him from the 1970s when he leaked confidential military documents about the Vietnam War. Those documents chronicled how America planned and fought an entirely useless but deadly war in the forests, rice fields, and cities of Vietnam and other countries of Southeast Asia. In time, some of those secret documents appeared in a book, The Pentagon Papers . I read that book during my service at the US Environmental Protection Agency. I learned something about the Pentagon, the industrial-military complex, and that bitter conflict. But I also learned something about Ellsberg. I admired his decision to risk everything for a higher purpose: telling Americans the war in Vietnam was immoral and unwinnable. His courage was contagious. I could see his life was blowing the whistle on Pentagon corruption and, especially, Pentagon’s planning for “fighting” nuclear wars. This touched me profoundly. I, too, was a whistleblowe...