The First Air Defense Operations Command, also called the Central Region Air Defense Sector, has an operations center sector in Taji and operations centers in Taji, Taqaddam, Salman Pak, Kut, Najaf and Nukhib. The Second Air Defense Operations Command, also known as the Western Air Defense Command, has bases located at the South Oil Company, H-3 airfield with H-1 airfield, and Rutba. The Third Air Defense Operations Command, also known as the Southern Air Defense Operations Command, has bases located in the South Oil Company, Tallil Airport, and the international oil companies in Tallil, Al-Amarah, Salman, and Zubair The 4th Air Defense Operations Command, also known as the Northern Air Defense Operations Command, is headquartered at the North Oil Company in Kirkuk, with the international oil companies in Kirkuk and Mosul.