The memorial ceremony is held for five helicopter crew members who were dead when their aircraft crashed in a quake relief mission, in Chengdu, capital of southwest China's Sichuan Province, on June 16, 2008. The Mi-171 military transport helicopter was carrying injured civilians when it crashed deep in the mountains in air turbulence on a return trip from Lixian County to Chengdu on May 31. [Xinhua]