the city and installed the Hadi government in overall control of Taizz. The Yemeni army has been reinforced by thousands of volunteers under Tareq Saleh's national resistance forces. Elements of the republican guard and the Giants brigade have joined the Yemeni army against the Houthis. Organization Yemen's military is divided into an army, navy, air force, and the presidential guard. The army is organized into eight armored brigades, 16 infantry brigades, six mechanized brigades, two airborne commando brigades, one surface-to-surface missile brigade, three artillery brigades, one central guard force, one Special Forces brigade, and six air defense brigades, which consist of four anti-aircraft artillery battalions and one surface-to-air missile battalion. "A military takeover could only realistically be launched by one of the five Area Commanders. Having himself come to power by coup, Saleh has been extremely careful to select Commanders whose loyalty is ensured by tribal bonds. Members of Saleh's Sanhan tribe control all military districts and most high security posts, with the commanders enjoying blood and/or close ties to Saleh. The Commanders report directly to the President, outside the normal channels of the Ministry of Defense and without constitutional mandate. They are the final authority in nearly every aspect of regional governance. In practice, they behave like tribal sheikhs and super-governors, parceling out new schools, water projects, and money. Despite periodic efforts to integrate military units, the Commanders recruit largely from regional tribes." As of September 2005, "Brigadier General Ali Mohsen al-Ahmar, Commander of the Northeastern region, is the most powerful of these military elites. The commander of the Eastern Area is BG Mohammed Ali Mohsen. The Eastern Area includes the governorates of Hadramawt and Al-Mahrah. Ali Faraj is commander for the Central Area, which includes Al-Jawf, Ma'rib, al-Bayda, and Shabwa, while the Southern Commander, controlling the Aden, Taiz, Lahij, al-Dhala and Abyan, is Abd al-Aziz al-Thabet. Finally, BG Awadh bin Fareed commands the Central Area, including the capital Sana'a. With the exception of Ali Mohsen, all of these commands are subject to periodic change or shuffle." The air force includes an air defense force. Yemen recently placed an order for TOR air defence systems, which will be far more advanced than the current air defense systems in place. The TOR order has been completed. The Yemeni Army has a total active strength of 66,700 troops. In 2001, Yemen's National Defense Council abolished the existing two-year compulsory military service,