While the names of most ranks of the Hellenic Air Force (HAF) are Greek language calques of RAF ranks, the HAF equivalent of O-7/OF-6 is "Taxiarchos tis aeroporias", which may be literally translated from modern Greek as "brigadier of the air force" (or "aviation brigadier"). (A free translation of the army rank of "taxiarchis", which originated in ancient Greece, is "one who orders" and the Greek root τάξις "taxis" is also the basis of the aviation term taxi – that is, to move one or more aircraft on the ground.) Nevertheless, "Taxiarchos tis aeroporias" is normally rendered into English as "air commodore" and the rank was introduced during the Second World War, after the Greek armed forces were reconstituted in exile, often alongside or within Commonwealth military formations, such as RAF Middle East Command.