Once the war starts, I want to join the army, but I don't know how to report it.

Think about recruiting after the war, not telling them to die. Moreover, there are enough troops now, and the active troops are ahead after the war, and many reserves will be recalled urgently. As soon as I was discharged from the army, I went to the armed forces department to register for reserve service. Every veteran must serve in the reserve. In wartime, the country is in chaos, and there will be emergency conscription only when no one is fighting. Conscription in peacetime will not be carried out in wartime. At that time, you wouldn't even let you go if you wanted to. What are you doing?