The Syrian Air Defense Force is an independent command within the Syrian Armed Forces. It has been merged into and then separated from both the Syrian Arab Army and the Syrian Arab Air Force. The Syrian Air Defense Force controls four air defense corps, eleven air defense Divisions and thirty-six air defense brigades, each with six SAM battalions. It is equipped with 650 static S-75 Dvina, S-125 Neva/Pechora and S-200 launchers, 200 mobile 2K12 Kub and Buk launchers and over 4,000 anti-aircraft guns ranging from 23mm to 100mm in caliber. There are also two independent 9K33 Osa SAM Regiments, each with four batteries of 48 mobile SAMs.