While I was in the Army stationed in Korea, I was in a field training exercise. I was doing my night patrol, i noticed with my night vision glasses an object above the hills moving back and forth, for about 35 minutes. Then soon after,3 helicopters flew over me and toward the object. As soon as they came close to it, it darted straight up in the sky. I thought i was seein a training, but as soon as the choppers left, it came back down and started moving ghe same way again. My rounds was over but i woke up the person next for his turn. I showed him what I saw and he witnessed it too. For 4 hours we watched this object move above the hill. The helicopters came 3 times and every time it shot straight in the air. About 6 am,before sunrise, it moved colse to us and shot straight in the air. It looked like a orange red light but could not see any more of what it could be. My and my friend were the only ones to see it. We told our superiors but they laughed it off. I know i saw something and Im sure the Koreans saw it too. Just thought Id share it with someone. Thanks for letting me share.