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Another major task for the Det was de-conflicting training exercises between the Koreans and the American military. In the 1960s, the North Koreans would send teams south across the DMZ or by boat to wage brutal terror campaigns against the South Korean people, often wiping out villages and murdering entire families. “If Koreans see anyone in their area, the South Koreans would always tell the mayor. South Koreans would know when Special Forces guys were in the area or any other unit,” Lavoie said. In this state of fear, it was important to make sure that everyone knew what was a friendly training exercise and what was a hostile invasion.

One day in 1966, a team of North Koreans infiltrated down the east coast and came ashore in the south. Two school children saw a couple soldiers walking along a rice paddy and told their parents about it. If the South Korean military was doing an exercise in the area, their school would have announced it to the students beforehand. Their parents called the police, who called the military, and it was soon realized they were dealing with a North Korean infiltration. Lavoie and another Green Beret from the Detachment went out with a Korean Special Forces quick reaction force.

While searching for the infiltrators, it was discovered they had already wiped out a small village, killing women and children. It was suspected that the North Koreans were visually identified by the villagers, so they were murdered to prevent further compromise. The South Koreans slowly closed the net on the six infiltrators, squeezing them up on top of a hill that had been surrounded. Lavoie and his teammate stood at the base of the hill as the South Koreans closed in. The sound of gunfire reverberated down the side of the mountain toward the Green Berets, announcing that the infiltrators were finished.