Joseph,
Fake news.
Harav Yaakov Moshe Kulefsky, zt”l, was drafted into the U.S. Army in August, 1944 at the age of eighteen. Despite learning in yeshiva at the time, he was drafted due to a backlash against those who falsely claimed to be doing so. Instead of refusing to serve or moving to Canada, he walked to the Induction Center in Manhattan on the day he was ordered to do so, which happened to be Shabbos. While he fortunately spent the next eighteen months until his discharge stateside, that wasn’t guaranteed or in his control and he could have just as easily been shipped out to the European or Pacific fronts.
He was not alone and there are plenty of books and articles about other frum boys who were drafted and served honorably, some of whom didn’t make it home.