Three months after immigrating to the United States, I received a letter asking me to join the army, asking me to check the information and send it back.

You must return this letter, just to register your information, not to ask you to join the army now. If you are asked to join the army in the future, you can not go. This is an optional service. All men under the age of 26 must register. If you don't register, you will go to college in the future and want to apply for a grant. You didn't register? Please apply again after registration. Want to become an American citizen, not registered? Why don't you register? My neighbor didn't register when he was young, but now he is over 40 years old and wants to be naturalized. Without a reasonable reason, he refused forever, even without a lawyer. When I came to the United States, I was over 26 years old, so SELETIVE SERVICE didn't have my information, but every year when I applied for financial aid for the next year, I was repeatedly asked why I didn't have my information. I had to copy my green card to school again and again to prove that I was over 26 when I came to America. If you don't know, ask a few more people to see if I'm right.