Almost every morning for five years, 1st Lt. Sukhbir Toor has pulled on the uniform of the U.S. Marine Corps. On Thursday, he also got to put on the turban of a faithful Sikh. It was a first for the Marine Corps, which almost never allows deviations from its hallowed image, and it was a long-awaited chance for the officer to combine two of the things he holds most dear. “I finally don’t have to pick which life I want to commit to, my faith or my country,” Toor, 26, said in an interview. “I can be who I am...