It makes him unique. Special.
In ceremonial roles and in combat "special" is the last thing you want to be. Sticking out detracts from the group's image, and may distract from the subject being honored.
Even worse in combat, where what draws the eye will draw fire. Endangering yourself and everyone around you.
.
No such thing as a personal problem in the military, they effect the entire group you're with.
To the people complaining: Sikh regiments have been helping the British since 1846. Some of the earliest pictures show Sikhs wearing turbans. He's respecting traditions, so grow the fuck up. My grandfather (a RAF engineer) respected them and seems to have served with them (unfortunately, I cannot ask him now). One of my earliest memories of my grandparents' house is of a painting of a Sikh man wearing a turban and my grandfather also had a kirpan hanging on the wall. Keep in mind that my grandparents were Christians.
It ain't about religion, but uniformity. At least have enough Sikh guards that they get into a symmetrical formation. And for God's sake, do not look special on the battlefield.
In ceremonial roles and in combat "special" is the last thing you want to be. Sticking out detracts from the group's image, and may distract from the subject being honored.
Even worse in combat, where what draws the eye will draw fire. Endangering yourself and everyone around you.
.
No such thing as a personal problem in the military, they effect the entire group you're with.