Non-commissioned officers are the lowest ranks of volunteers. Under normal circumstances, conscripts should be transferred to non-commissioned officers after serving for two years, that is, first-class non-commissioned officers. In fact, it is not a first-class (period) sergeant, but a soldier with the rank of corporal, not an official.
In the story of the cookhouse squad, the squad leader Hong is a third-class non-commissioned officer-the rank of staff sergeant, and the squad leader is the so-called leader. Monitor Hong has several non-commissioned officers, first-class non-commissioned officers and conscripts. I feel that what you are asking for is to recruit non-commissioned officers directly. After half a year's training and assessment, you are a first-class petty officer. After all, the first year was just a soldier.