to correct the above statement, a sikh must wear a turban to be considered a sikh. it is the identity of a sikh. the newer generation still wear the turban as to maintain the Sikh religion and represent!!!
if you would like to learn more about the great religion sikhism, there are many internet sites that will explain better than i did, such as sikhnet.com
sikhs are not terrorists, but very peaceful people that defend people in need. sikhs are some of the most friendly and nicest people.