This seems like an obvious question but I couldn't find a satisfactory answer. My son studies overseas. He has a reentry permit that expires in January and school starts again in September. I know he needs a new I-131 and has to be in the US to apply. Why? The first step is to mail in the form and reentry permit. How would they know if he, or someone else, mails it in? More importantly, he then has to wait for up to two months before doing the biometrics. If he leaves the US to start school and then tries to return to do the biometrics can he get in, now that he's surrendered the permit? If he can then perhaps he can go and apply before school starts and return during Christmas break for the biometrics. Then he can go back to school to wait for the new permit. Do people normally just stay in the US while waiting? Please help. Thank you so much.