The Republic of China Army (ROCA), previously known as the Chinese Nationalist Army or National Revolutionary Army and unofficially as the Taiwanese Army, is the largest branch of the Republic of China Armed Forces. An estimated 80% of the ROC Army is located on Taiwan, while the remainder are stationed on the Penghu, Kinmen, Matsu, Dongsha and Taiping Islands. Since the Chinese Civil War, no armistice or peace treaty has ever been signed, so as the final line of defense against a possible invasion by the People's Liberation Army (PLA), the primary focus is on defense and counterattack against amphibious assault and urban warfare. Organization The ROC Army's current operational strength includes 3 armies, 5 corps. As of 2005, the Army's 35 brigades include 25 infantry brigades, 5 armoured brigades and 3 mechanized infantry brigades. All infantry brigades stood down and transferred to Reserve Command after 2005. This update reflects the ROCA order of battle at the conclusion of the Jinjing Restructuring Plan in 2008. A new type of unit called defense team () is being introduced. These are formed by elements of de-activated brigades under each area defense command. The strength of a defense team may vary from one or more reinforced battalions, making it roughly equal to a regiment. The team CO is usually a full colonel. In the event of war most of the high command would retreat to underground bunkers, tunnel complexes, and command posts. Republic of China Army Command Headquarters The ROC Army CHQ () is headed by a 3-star general and is responsible for overall command of all ROC Army assets. Army GHQ is subordinate to the Chief of the General Staff (military), the Minister of National Defense (civilian) and the ROC President. Internal Units: Personnel, Combat Readiness and Training, Logistics, Planning, Communications, Electronics and Information, General Affairs, Comptroller, Inspector General, Political Warfare. () 601 Air Cavalry Brigade (original special force battalion assigned transferred back to 862nd Brigade) 602 Air Cavalry Brigade (original special force battalion assigned transferred back to 862nd Brigade) 603 Air Cavalry Brigade (this is a phantom unit, only exists on paper, no manpower, units, helicopters assigned) 101st Reconnaissance Battalion (better known as Sea Dragon Frogman, has a company station in Kinmen, Matsu, 3 in Penghu, and other frontline islands) Special Forces Command () In charge of 3 training centers Army Airborne Training Center () Army Special Forces Training Center ()