Aug. 1 (UPI) -- For more than 70 years, the Republic of Korea-United States alliance has not only prevented a resumption of war on the peninsula, but has also deterred the use of nuclear weapons for two decades. This is a historic achievement, but the case for U.S. troops in Korea is fundamentally about the future, not the past. To secure American interests in a rapidly changing Asia-Indo-Pacific, and to ensure continued stability, prosperity and influence, the United States. requires a strong,