 Complete the following phrase:  Colonel Ahmad Nakhjavan completed his pilot training in 1925, and in February of the same year, he flew to Iran with a plane purchased from France, and landed in Qala-e-Marghi on the 5th of March. Ahmad Nakhjavan became the first head of the Iranian Air Force and was the director of aviation with him until 1937. During this time he was changed several times and fired, but each time he returned to service after a short time. In 1929 he became a brigadier general. In 1940, he became the acting Minister of War in Ahmad Matins cabinet, and in 1319, he was promoted to the rank of Major General. Nakhchivan was under the auspices of the Ministry of War until September 29, 1941, at the same time as the 