High school graduates, who have escaped from North Korea, salute a South Korean national flag during their graduation ceremony at the Hangyoreh Junior and Upper school for North Korean teenage defectors in Anseong, about 80 km (50 miles) south of Seoul, February 13, 2009. Eighteen students graduated from the school on Friday, three days before their former leader Kim Jong-il's birthday. North Korea has been assembling its longest-range missile at an east coast launch base and could test-fire the rocket by the end of this month at the earliest, a leading South Korean daily reported on Friday. REUTERS/Jo Yong-Hak (SOUTH KOREA)