FOUR hundred miles deep into the North African desert, Jim Doyle gathered the bundle of aerograms and month-old magazines that were his link to a former world, the one he had left behind to join the Peace Corps. This particular day in November 1967, the mail carried news about his college campus and hometown, the University of Wisconsin in Madison. There had been a protest against the Vietnam War, specifically a blockade against recruiters for the company that made napalm, and it had ended with tear gas, billy clubs, arrests and demonstrators taunting cops with cries of “Sieg heil!”