The air force ground recruits are tired. According to relevant public information, the ground work of the Air Force is busy, and the rest time depends on the flight time of aviation units. The more flight training, the busier it is. When not flying, the aircraft should be maintained and tested. The air force ground service is divided into four majors: machinery, ordnance, ad hoc and radio. These are four comfortable arms, with great responsibility. Aircraft is a kind of high-precision weapon equipment. In this unit, we should have a strong sense of responsibility and be bold and cautious.