Airport Security Unit police officers pose for photos in the uniforms from different periods of time since the special unit was formed 40 years ago, during an open day, Saturday, September 9, 2017. (Photo: China News Service/Tan Daming)
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Airport Security Unit police officers pose for photos in the uniforms from different periods of time since the special unit was formed 40 years ago, during an open day, Saturday, September 9, 2017. (Photo: China News Service/Tan Daming)
