Air Force ground handling centers on aircraft maintenance workers and directly maintains aircraft personnel. Ground handling covers a wide range, mainly including aviation maintenance personnel and resident personnel. Airport logistics support, including ordnance, aviation materials, oil, quartermaster, four stations, field service, fire control, air traffic control, communication, navigation, meteorology, automobile, health and security, is very hard work. After the crew retired, the airline was very willing to take it. They are collectively called ground handling. Air force ground service is the organizational unit to ensure flight. In the flying troops, the establishment of each regiment is generally a maintenance brigade, with four maintenance squadrons, of which three squadrons guarantee flight and 1 squadron is responsible for aircraft maintenance. Ground service is a technical arm, which is divided into mechanical, ad hoc, electronic, radar, electrical and ordnance. Maintenance units also include turning, pliers, milling, planing, grinding, painting, electroplating, sheet metal and accessories.