Question: Out of the cities hosting a brigade , which one is the oldest in Azerbaijan ?

text: Azerbaijan (Iran)
Politics -- Military
Several Iranian Army and Sepah divisions and brigades are based in Azerbaijan , including :
The name Azerbaijan itself is derived from Atropates, the Persian Satrap (governor) of Medea in the Achaemenid empire, who ruled a region found in modern Iranian Azerbaijan called Atropatene. Atropates name is believed to be derived from the Old Persian roots meaning protected by fire. The name is also mentioned in the Avestan Frawardin Yasht: âterepâtahe ashaonô fravashîm ýazamaide which translates literally to: We worship the Fravashi of the holy Atare-pata. According to the Encyclopaedia of Islam: In Middle Persian the name of the province was called Āturpātākān, older new-Persian Ādharbādhagān (آذربادگان/آذرآبادگان), Ādharbāyagān, at present Āzerbāydjān/Āzarbāydjān, Greek Atropatíni (᾿Ατροπατήνη), Byzantine Greek Adravigánon (᾿Αδραβιγάνων), Armenian Atrpatakan, Syriac Adhorbāyghān. The name Atropat in Middle Persian was transformed to Adharbad and is connected with Zoroastrianism. A famous Zoroastrian priest by the name Adarbad Mahraspandan is well known for his counsels. Azerbaijan, due to its numerous fire-temples has also been quoted in a variety of historic sources as being the birthplace of the prophet Zoroaster although modern scholars have not yet reached an agreement on the location of his birth. With Qajar Iran being forced to cede to Imperial Russia its Caucasian territories north of the Aras River (that is, modern-day Georgia, Dagestan, Armenia, and the Republic of Azerbaijan) during the course of the 19th century, through the treaties of Gulistan (1813) and Turkmenchay (1828), vast amounts of soil were irrevocably lost. Following the disintegration of the Russian Empire in 1917, as well as the short-lived Transcaucasian Democratic Federative Republic, in 1918, the leading Musavat government adopted the name Azerbaijan for the newly established Azerbaijan Democratic Republic, which was proclaimed on May 27, 1918, for political reasons, even though the name of Azerbaijan had always been used to refer to the adjacent region of contemporary northwestern Iran. Thus, until 1918, when the Musavat regime decided to name the newly independent state Azerbaijan, this designation had been used exclusively to identify the Iranian province of Azerbaijan.
Type Name City Province
Operational Headquarter of Army in North-West Northwestern Operational Headquarter of Ground Forces of Islamic Republic of Iran Army Urmia West Azerbaijan
Division ( military ) of Army 64th Infantry Division of Urmia Urmia West Azerbaijan
Division ( military ) of Army 21st Infantry Division of Azerbaijan Tabriz East Azerbaijan
Logistic Headquarter of Army Maraqeh District 4 Headquarter Maragheh East Azerbaijan
Brigade of Army 40th Infantry Separate Brigade of Sarab Sarab & Ardabil East Azerbaijan & Ardabil Province
Brigade of Army 41st Infantry Separate Brigade of Qushchi Urmia West Azerbaijan
Separate Brigade of Army 36th Armored Separate Brigade of Mianeh Mianeh East Azerbaijan
Army Training Centre of Army 03 Ajabshir Recruit Training Centre Ajab Shir East Azerbaijan
Military airbase of Islamic Republic of Iran Army Aviation Havanirooz Tabriz Base Tabriz East Azerbaijan
Military airbase of Air force Tactical Air Base 2 , or Paygah Dovvom-e Shekari Tabriz East Azerbaijan
Agency of Navy Navy Office of Tabriz Tabriz East Azerbaijan
Provincial Corps Ardabil Hazrat Abbas Provincial Corps Ardabil Ardabil province
Provincial Corps West Azerbaijan Shohada Provincial Corps Urmia West Azerbaijan
Provincial Corps East Azerbaijan Ashura Provincial Corps Tabriz East Azerbaijan
Provincial Corps Zanjan Ansar al-Mahdi Provincial Corps Zanjan Zanjan province