BRUSSELS — Dozens of American students at a U.S. military installation in Germany walked out of their middle school on Tuesday as part of protests aimed at an official visit by Defense Secretary Pete Hegseth, underscoring the scope of disillusionment with the Trump administration’s crackdown on diversity, equity and inclusion (DEI) initiatives.The students attend Patch Middle School in Stuttgart, Germany, and peacefully walked out of class for nearly an hour, according to three people familiar with the matter and a letter sent to parents by a school administrator. Separately, a small group of adults dressed in civilian clothing — likely...