Liu Xinghua (L), Zhong Da (M) and Jia Zhenxin, veterans of the Korean War, attend the 13th PIP (China Pingyao International Photography Festival), in Pingyao City of north China's Shanxi Province, Sept. 20, 2013. Over 50 photos of the Chinese People's Volunteers taken during the Korean War were displayed in the exhibition. (Xinhua/Zhan Yan)