“I GRADUATED FROM university in 1968. I was drafted immediately. I had not really thought much about the war, but the more I talked to the guys who were coming back from Vietnam, the more I realized that this thing was terribly wrong. I began to think of the Vietnamese forces as liberation forces trying to free their country from foreign invasion—we were the invaders.

I went through a crisis of conscience. I saw a news report about soldiers who were speaking out against the war. I thought to myself, I can do that. I began to organize among soldiers in the barracks. We submitted a petition signed by 1,300 active-duty service members that was published in The New York Times.

The basis of my commitment to activism is faith: the belief that our role in life is to serve others, to overcome suffering and injustice, especially war, which to me, is the greatest sin."