Why do we need military training for criminals in people's prisons?

Strictly speaking, it's not military training. This is a team that trains new criminals.

Every new prisoner needs to go through this stage, which takes about one to two months. During this period, it is mainly to let new prisoners learn prison behavior, cultivate obedience (such as walking in line, broadcasting gymnastics ...), as well as ideological study (there are certain courses to attend every day). Prison staff will attend classes or practice separately, be familiar with prison rules and regulations and reward and punishment systems, adjust prisoners' reform ideas, practice three steps to strengthen their physique, and then be assigned to various prison areas to participate in productive labor.