8老师， 我弟弟的F1签证5年期的还有效，这样能回美吗？非常着急，谢谢老师。
-Technically, yes, but practically it is very risky and I don't suggest him to leave unless he has no choice. Also, he needs to have the employment verification letter from the employer, just in case. He also needs to talk to the school International Student Office before leaving.
