The Vietnam War, the murders of Martin Luther King Jr. and Robert Kennedy, the civil rights movement, the Student Strike of 1970 – to hear the graduates of the Classes of 1970 and 1971 talk, it was as if this all happened yesterday. Most of them can still remember their draft number. “These were combustible years of high drama in every setting,” Steve Ingraham ’70 said to a collection of his classmates at Memorial Chapel at an assembly last Friday morning. The 50th reunion took place April 28 through May 1. For alumni, it was a makeup for a…