HONG KONG, July 1, 2016 (Xinhua) -- Soldiers of Hong Kong Garrison of the Chinese People's Liberation Army (PLA) perform during the open day in south China's Hong Kong, July 1, 2016. To celebrate the 19th anniversary of Hong Kong's return to the motherland, Hong Kong Garrison of PLA held an open day, allowing local residents to visit their barracks on Friday. (Xinhua/Liu Yun)