Four officers in the army refer to

The military service system implemented in China is a combination of conscripts and volunteers. After two years of military service in the army, ordinary soldiers can be converted into junior noncommissioned officers with the approval of the chief officers of regimental (brigade) units as needed. There is a saying in our army: "Non-commissioned officers are not officials, but non-commissioned officers are like officials." It fully explains the essence of petty officers.

Non-professional noncommissioned officers are mostly junior noncommissioned officers, such as leading troops. Generally speaking, non-professional noncommissioned officers can only work for one or two periods. Non-professional non-commissioned officers rarely reach the third and fourth grades, and they are all excellent. In other words, if you don't do well, it is difficult for a second-class non-professional sergeant to be promoted to a third-class sergeant. Non-commissioned officers above grade four are generally professional non-commissioned officers. Professional noncommissioned officers are very professional, and only some highly skilled professions and units have them. Most of them are engaged in maintenance and professional arms maintenance, such as missile maintenance, anti-aircraft gun maintenance, radar maintenance and so on. Generally speaking, it is not easy to be a senior noncommissioned officer. There are too few senior noncommissioned officers in a major military region, and there are also too few six-level noncommissioned officers in a major military region. Six-level noncommissioned officers are equivalent to the treatment of deputy regimental level (positive regimental level), and five-level noncommissioned officers are equivalent to the treatment of full-time battalion level, so professional noncommissioned officers are generally easier to be promoted in the army.