I have got experience, practical experience, that the drafting board of your country, calling some boy that "You join military," but he is not willing. Why? Because he is not trained as a ksatriya. He is trained as a sudra. Therefore the caste system is very scientific. A section of people should be trained as brahmanas. Those who are intelligent enough in the society, they should be picked up for being trained in higher philosophical science. Those who are less intelligent than the brahmanas, they should be given military training. We require everything - not that everyone is military man. This is nonsense. How everyone can be military man? Because they are sending sudras to Vietnam they are unnaturally being killed. So any country who is very proud of scientific advancement, if he does not know how to organize society, he is a fool.
Lecture on Bhagavad-gita 7.1, San Francisco, 17 March, 1968