240 main battle tanks (MBT) but lacked adequate mechanized infantry support. There was little evidence of the use of armored personnel carriers during the Sino-Vietnamese border conflict in 1979, and tanks were used as mobile artillery and as support for dismounted infantry. Artillery forces emphasized towed guns, howitzers, and truck-mounted multiple rocket launchers. In the 1980s some self-propelled artillery entered service, but the PLA also produced rocket launchers as a cheaper but not totally effective alternative to self-propelled guns. There was a variety of construction equipment, mobile bridging, trucks, and prime movers. A new multiple rocket launcher for scattering antitank mines appeared in 1979, but mine-laying and mine-clearing equipment remained scarce. Regional forces consisted of full-time PLA troops organized as independent divisions for garrison missions. Garrison divisions were static, artillery-heavy units deployed along the coastline and borders in areas of likely attack. Regional forces were armed less heavily than their main-force counterparts, and they were involved in training the militia. They were the PLA units commonly used to restore order during the Cultural Revolution. When chairman Mao proclaimed the People's Republic of China on October 1, 1949, the PLAGF was a 4.9 million-strong peasant army. After some time, the demobilization of ill-trained and politically unreliable troops began, resulting in the reduction of army strength. In the 21st century, the PLA Ground Forces are continuing to undergo significant reform, experimentation, modernization, and restructuring to deal with potential threats and enhance their capabilities. Divisions are downsized into combined arms brigades, which reorganized into high-readiness army groups. The division echelon is phased out with only a limited number of division structures remaining existent. While the size of the PLA Ground Force has been reduced over the past few decades, technology-intensive elements such as special operations forces (SOF), army aviation (helicopters), surface-to-air missiles (SAMs), and electronic warfare units have all been rapidly expanded. The latest operational doctrine of the PLA ground forces highlights the importance of information technology, electronic and information warfare, and long-range precision strikes in future warfare. The older generation telephone/radio-based command, control, and communications (C3) systems are being replaced by integrated battlefield information networks featuring local/wide-area networks (LAN/WAN), satellite communications, unmanned aerial vehicle (UAV)-based surveillance and reconnaissance systems, and mobile command and control centers. Structure Organizations The People's Liberation Army Ground Force (PLAGF) operates under the command authority of the Central Military Commission through theater commands (TC). The People's Liberation Army