The full turban is probably worn shortly after the boy reaches manhood (possibly after he breaks his voice) but I'm not sure about this.
I can understand the need about wearing the turban, it's a religious right and an individual right to wear one but in the face of 9-11, everyone (and I do mean everyone) has to go through the rigours of security. What's so hard about not wearning a turban and taking photographs if it will save you the hassle of getting a passport and what-not? The alternative would be no more flying or worse...
In terms of wearing the burqa, though I don't agree with it, I do respect the woman's decision to wear one. However, like the turban, you should remove it completely in order to take your picture. For goodness sake, if everyone can take photos and wear the burqa, we'd be having terrorists walking around in them.
Anyways, if you're interested in the history of the turban (it does have Christianity related background), you can read all about here:
[A href="vny!://www.sikhnet.com/sikhnet/register.nsf/f121af51cccab1c58725670b007faabb/c2a8b1162cbcac1887256acc0083b771!OpenDocument&Highlight=0,turban"][FONT size=1]vny!://www.sikhnet.com/sikhnet/register.nsf/f121af51cccab1c58725670b007faabb/c2a8b1162cbcac1887256acc0083b771!OpenDocument&Highlight=0,turban[/FONT][/A]