Air force warplanes in penetration drill

Two fighters seen in the photo taken on July 28, 2014 land on the runway in a military airport in northwest China. Recently, an aviation troop unit under the air force of the Lanzhou Military Area Command (MAC) of the Chinese People's Liberation Army (PLA) conducted the low-altitude and super-low-altitude defense penetration drill, in a bid to lift the overall combat capability of the troop unit to a new level. (kj.81.cn/Chen Qingshun)