Indian or not?

In todays issue of Times of India, there is an article about 'Indian' brains manning the next NASA mission to Mars. I don't understand why we are so hell-bent on calling these people Indians. They are in the US, working for the US companies, and will aim to settle there get a green card, make sure their children are born in the US so that they get citizenship at birth. And we are the ones who are proud of them. Why??? The article also says that Sunita Williams is from India. I fail to see how, seeing as she was born in Euclid, Ohio. Her parents are from India. But we insist on congratulating ourselves for producing people who go abroad and we call them the Indian diaspora.
The emphasis is on the word Indian. Are they really Indian??