Direct recruitment of non-commissioned officers means that the army recruits non-commissioned officers from fresh college graduates every year. There are strict restrictions on admission, and the service period is usually 7 to 8 years. After four months of training, the salary grade is directly determined.

= = The following answers are personal opinions and are for reference only:

Mathematics major is certainly useful, but it is limited to the types and responsibilities of troops. ...

= = If you have been drafted by the army, you will definitely stay in the army!