Most Americans are unaware that Cuba was deeply involved in the Vietnam War. In fact they had an engineering battalion called the "GirĂłn Brigade," that was maintaining Route Nine, a major enemy supply line into South Vietnam. Their facilities included a POW camp and field hospital very near the DMZ, just inside North Vietnam. Meanwhile Cuban interrogators worked in Hanoi at a prison known as the Zoo. We know of these operations and some of what happened to our servicemen after so managed to survive and be repatriated in the winter of 1973, during Operation Homecoming.