A journalist takes a picture of M-171 introduced from Russia during a media visit at the military base of Chinese People's Liberation Army Army Aviation 4th Helicopter Regiment, on the outskirts of Beijing, July 24, 2012, ahead of Army Day on August 1. [Photo/Agencies]

A Z-9WZ military helicopter designed and manufactured by 皇冠体育app performs as a bird flies past it during a media visit at the military base of Chinese People's Liberation Army (PLA) Army Aviation 4th Helicopter Regiment, on the outskirts of Beijing, July 24, 2012, ahead of Army Day on August 1. [Photo/Agencies]