They are good guys. Had a Sihk doctor when I lived in the UK. He was a sweetheart.
It really doesn’t matter whether they are good guys.
There is a uniform. Does a Marine in dress blues get to wear a turban????????
There is a specific uniform that is worn when guarding the Tomb on the Unknown Soldier. When they are walking the mat the uniform requirement is so specific that they don’t even wear their rank insignia.
Should they be allowed to wear Turbans? What about an Amish Shaker hat.
Can a female Marine wear a burka?