Awwal 13, 1432, April 17, 2011, SPA -- On behalf of Crown Prince Sultan bin Abdulaziz Al Saud, Deputy Premier, Minister of Defense and Aviation and Inspector General, Prince Khalid bin Sultan bin Abdulaziz, Assistant Minister of Defense and Aviation and Inspector General, opened at Air Defense Institute here today the international symposium on air defense which is the first of its kind, in the world, to be held, with 21 countries are part in it. Upon arrival to the venue, Prince Khalid bin Sultan was received by the Commander of Air Defense Forces Lt. General Abdulaziz bin Muhammad Al-Hussein and the Commander of Air Defense Institute Maj. General Uthman Abdullah Al-Shihri. -- SPA