** FILE ** A worker sweeps outside the College of Computer Science & Technology on the Yuquan campus of Zhejiang University in Hangzhou, China, on Thursday, Feb. 21, 2013. Unit 61398 of the People's Liberation Army, which has been recruiting computer experts from the school for at least a decade, is alleged to be one of several hacking operations run by China's military. (AP Photo)

Photo by: Uncredited

** FILE ** A worker sweeps outside the College of Computer Science & Technology on the Yuquan campus of Zhejiang University in Hangzhou, China, on Thursday, Feb. 21, 2013. Unit 61398 of the People's Liberation Army, which has been recruiting computer experts from the school for at least a decade, is alleged to be one of several hacking operations run by China's military. (AP Photo)