Up to 1920 (1299) there was no use of air power in the armed forces. By then Reza Pahlavi became commander in chief of the Armed Forces, and realized the importance of air power in future conflicts. In 1921 (1300) the ambassador in Washington DC requested to purchase aircrafts from the U.S. The U.S. officials denied the request based on the disarmament treaty of World War I. Therefore had to turn to European countries, such as Germany, Russia and France. The first country to acknowledge request was Germany, which agreed to sell some JUNKERS aircraft ( JU-F13).