In this combination of photos, a June 10, 1989 file photo, top, shows Peoples Liberation Army (PLA) troops standing guard with tanks in front of Tiananmen Gate, and almost 25 years later, a May 28, 2014 photo, bottom, shows Chinese paramilitary policemen marching through to clear tourists from the area for a flag-lowering ceremony on Tiananmen Square in Beijing. (Sadayuki Mikami, top, Alexander F. Yuan, bottom/Associated Press)