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Why is there a saying in the army that a person will be punished if he does something wrong?

No rules, no Fiona Fang, iron and blood to catch up, cast a warm-blooded man.

Do you think that if you make mistakes every day and bring trouble to the whole group, you are thick-skinned and embarrassed to be punished every time? This method is to make you feel guilty, unwilling to lag behind, and don't want to implicate others yourself! This is a collective, sharing weal and woe.