“Lieutenant,” Ray finally said. “You take the corn husk off.”

I was from a logging town on the Oregon coast. I’d heard of tamales, but I’d never seen one. Until I joined my company of Marines in Vietnam, I’d never even talked to a Mexican. Yes, people like me called people like Ray “Mexicans,” even though they were as American as apple pie — and tamales. Racial tension where I grew up was the Swedes and Norwegians squaring off against the Finns every Saturday night in the parking lot outside the dance at the Labor Temple.

President Harry Truman ordered the integration of the military in 1948. By the time of the Vietnam War, the races were serving together. But putting everyone in the same units is very different than having them work together as a unit.

Our national memory of integration is mostly about the brave people of the civil rights movement. Imagine arming all those high school students from Birmingham, Ala. — white and black — with automatic weapons in an environment where using these weapons was as common as having lunch and they are all jacked up on testosterone. That’s racial tension.

During the war there were over 200 fraggings in the American military — murders carried out by fragmentation grenades, which made it impossible to identify the killer. Almost all fraggings, at least when the perpetrator was caught, were found to be racially motivated.

And yet the more common experience in combat was cooperation and respect. If I was pinned down by enemy fire and I needed an M-79 man, I’d scream for Thompson, because he was the best. I didn’t even think about what color Thompson was.

White guys had to listen to soul music and black guys had to listen to country music. We didn’t fear one another. And the experience stuck with us. Hundreds of thousands of young men came home from Vietnam with different ideas about race — some for the worse, but most for the better. Racism wasn’t solved in Vietnam, but I believe it was where our country finally learned that it just might be possible for us all to get along.