You meant US..
A simple fact, It would be stupid to produce anything and induct.
There are a few things which is not economical to produce, and moreover when we don't have the cutting edge technology, obviously not like US. So why not buy the best?
Our local industry would take sometime to mature, but still countires like US, Russia, France etc, they are having immense experience in producing arms.
Why would I buy a GAS jeans when John Players is also a good brand and Indian. It is good but can't Remiss the GAS JEANS.
Your local industry will never develop if you don't invest in it. How will India learn how to make howitzers if it doesn't invest in R&D?