Division, the 15th Special Forces Division has been identified by Human Rights Watch in 2011. The former Defense companies were merged into the Syrian Army as the 4th Armored Division and the Republican Guard. The 4th Armored Division became one of the Syrian government's most trusted security forces. Syrian Air Force The Syrian Arab Air Force is the aviation branch of the Syrian Armed Forces. It was established in 1948 and saw combat in 1948, 1967, 1973 and in 1982 against Israel. It has seen combat against militant groups on Syrian soil from 2011 to 2012, during the Syrian civil war. Presently there are at least 15 Syrian air force bases throughout the country. In 2011, Russian sources reported 40,000 personnel in the Air Force, while Reuters reported 100,000. Syrian Navy In 1950 the Syrian Navy was established following the procurement of a few naval craft from France. The initial personnel consisted of soldiers who had been sent to French academies of naval training. In 1985 the Navy consisted of approximately 4,000 regular and 2,500 reserve officers and men. The navy is under the army's Latakia regional command. The fleet was based in the ports of Latakia, Baniyas, Minat al Bayda and Tartus. Among the 41 vessel fleet were two frigates, 22 missile attack craft (including ten advanced Osa II missile boats), three old submarines, two submarine chasers, four mine warfare vessels, eight gunboats, six patrol craft, four missile corvettes (on order), three landing craft (on order), one torpedo recovery vessel and, as part of its coastal defense system, Sepal shore-based, anti-ship missiles with a range of 300 km. In 2011, the Navy was estimated have 5,000 personnel. Syrian Air Defence Force In 1987, according to the Library of Congress Country Studies, the Air Defence Command, within the Army Command but also composed of Air Force personnel, numbered approximately 60,000. In 1987 units included 20 air defense brigades (with approximately 95 SAM batteries) and two air defense regiments. The Air Defence Command had command access to interceptor aircraft and radar facilities. Air defenses included SA-5 long-range SAM batteries around Damascus and Aleppo, with additional SA-6 and SA-8 mobile SAM units deployed along Syria's side of the Lebanese border and in eastern Lebanon. At some later point in time, the Air Defence Command was upgraded into a separate Syrian Air Defense Force. In 2011, Russian sources reported 60,000 personnel in Air