Capt. Tejdeep Singh Rattan, a 31-year-old dentist, graduated Monday at Fort Sam Houston after the Army made an exemption to a uniform policy that has effectively prevented Sikhs from enlisting since 1984. "I'm feeling very humbled. I'm a soldier," he said, grinning after the ceremony as other members of the Sikh community milled about nearby. "This has been my dream." Rattan had to get a waiver from the Army to be allowed to serve without sacrificing the unshorn hair mandated by his faith. An immigrant from India who arrived in New York as a teenager, Rattan said it was important for him to serve a country that has given him so many opportunities.The article I've linked above has a picture of CPT Rattan at his graduation and contains a little bit of info about uniform modifications and wear:
During training, Rattan wore a helmet over the small turban, which he doesn't remove, and was able to successfully create a seal with his gas mask despite the beard, resolving the Army's safety concerns, said Harsimran Kaur, the Sikh Coalition's legal director. Rattan worked with an Army tailor to create a flash, the insignia patch worn on soldiers' berets, that could be affixed to his black turban, she said.But the way I first found out about this whole story was coming across this picture, which is totally badass, and shows Rattan in ACUs and a Universal Camouflage Pattern-ed (UCP) turban with captain's bars on the front. Awesome.

I wonder if he carries the kirpan, the iron bracelet, and the undergarments, too? (As an aside: when I spent my fabulous summer in Quantico, a Mormon guy in my platoon got an unbelievable amount of crap from the Sergeant Instructors over his wearing of what's apparently called the Temple undergarment. Nonconformity + military = fun & yuks.)
Seriously, though, I think this Sikh thing is pretty awesome. Sikhs have a long and distinguished history of military service: while they make up only two percent of the Indian population, they account for nearly one-third of the Indian army's officer corps. The British military has managed ethno-linguistic/sectarian nonconformity in personal appearance for centuries, so you'd figure the U.S. military can sort out a way to create an effective gas mask seal around facial hair. This is a good-news story for the country and the Army.