File photo of a visitor to the China Aviation Museum taking a photograph of a row of old anti-aircraft guns on display in Beijing

 
File photo of a visitor to the China Aviation Museum taking a photograph of a row of old anti-aircraft guns on display in Beijing
A visitor to the China Aviation Museum, located on the outskirts of Beijing, takes a photograph of a row of old anti-aircraft guns on display in this August 17, 2010 file photo. REUTERS/David Gray/Files