General Amir Ali Hajizadeh, the head of the Revolutionary Guard's aerospace division, speaks at Tehran's Islamic Revolution and Holy Defence museum, during the unveiling of an exhibition of what Iran says are US and other drones captured in its territory, in the capital Tehran on September 21, 2019. - Iran's Revolutionary Guards commander today warned any country that attacks the Islamic republic will see its territory become the "main battlefield" as he opened an exhibition of captured drones. (Photo by ATTA KENARE / AFP)