Respectfully your calculations are way off. They needed 400,000 men to hold the line in Korea because they were facing 750,000 Chinese, and another 200,000 North Koreans. In 1965 the NVA had about 1/3 of that strength. The line could be held by 2 Marine, 4 Army, 2 ROK, 4 ARVN Divisions, plus 2-3...