A visitor looks at a helicopter K209 displayed by FAMA during the first day of Africa Aerospace and Defense 2014 Exhibition in Waterkoof Air Force Basement on the southern outskirts of the administrative capital of Pretoria, on Sept. 17, 2014. The exhibition is the largest one of its kind in Africa. A total of 347 exhibitors from 26 countries and regions took part in the biennial exhibition which will last till Sept. 21. (Xinhua/Zhai Jianlan)

Brazilian military officers look at a model of China's aircraft carrier "Liaoning" during the first day of Africa Aerospace and Defense 2014 Exhibition in Waterkoof Air Force Basement on the southern outskirts of the administrative capital of Pretoria, on Sept. 17, 2014. The exhibition is the largest one of its kind in Africa. A total of 347 exhibitors from 26 countries and regions took part in the biennial exhibition which will last till Sept. 21. (Xinhua/Zhai Jianlan)

A visitor looks at a vehicle mounted mine detector displayed by Husky during the first day of Africa Aerospace and Defense 2014 Exhibition in Waterkoof Air Force Basement on the southern outskirts of the administrative capital of Pretoria, on Sept. 17, 2014. The exhibition is the largest one of its kind in Africa. A total of 347 exhibitors from 26 countries and regions took part in the biennial exhibition which will last till Sept. 21. (Xinhua/Zhai Jianlan)

Visitors talk with each other beside bombs displayed by DENEL during the first day of Africa Aerospace and Defense 2014 Exhibition in Waterkoof Air Force Basement on the southern outskirts of the administrative capital of Pretoria, on Sept. 17, 2014. The exhibition is the largest one of its kind in Africa. A total of 347 exhibitors from 26 countries and regions took part in the biennial exhibition which will last till Sept. 21. (Xinhua/Zhai Jianlan)

A South African military officer (1st L) talks with students about torpedos during the first day of Africa Aerospace and Defense 2014 Exhibition in Waterkoof Air Force Basement on the southern outskirts of the administrative capital of Pretoria, on Sept. 17, 2014. The exhibition is the largest one of its kind in Africa. A total of 347 exhibitors from 26 countries and regions took part in the biennial exhibition which will last till Sept. 21. (Xinhua/Zhai Jianlan)

A visitor looks at pictures displayed by China National Precision Machinery Import & Export Corporations during the first day of Africa Aerospace and Defense 2014 Exhibition in Waterkoof Air Force Basement on the southern outskirts of the administrative capital of Pretoria, on Sept. 17, 2014. The exhibition is the largest one of its kind in Africa. A total of 347 exhibitors from 26 countries and regions took part in the biennial exhibition which will last till Sept. 21. (Xinhua/Zhai Jianlan)

Xu Dazhe (2nd L), Deputy Minister of Industry and Information Technology of China and Director of State Administration of Science, Technology and Industry for National Defense of China, visits the Chinese pavilion during the first day of Africa Aerospace and Defense 2014 Exhibition in Waterkoof Air Force Basement on the southern outskirts of the administrative capital of Pretoria, on Sept. 17, 2014. The exhibition is the largest one of its kind in Africa. A total of 347 exhibitors from 26 countries and regions took part in the biennial exhibition which will last till Sept. 21. (Xinhua/Zhai Jianlan)

A South African military officer tests an ultra short missile launch system during the first day of Africa Aerospace and Defense 2014 Exhibition in Waterkoof Air Force Basement on the southern outskirts of the administrative capital of Pretoria, on Sept. 17, 2014. The exhibition is the largest one of its kind in Africa. A total of 347 exhibitors from 26 countries and regions took part in the biennial exhibition which will last till Sept. 21. (Xinhua/Zhai Jianlan)

South African jets fly over the sky during the first day of Africa Aerospace and Defense 2014 Exhibition in Waterkoof Air Force Basement on the southern outskirts of the administrative capital of Pretoria, on Sept. 17, 2014. The exhibition is the largest one of its kind in Africa. A total of 347 exhibitors from 26 countries and regions took part in the biennial exhibition which will last till Sept. 21. (Xinhua/Zhai Jianlan)