A news item in your daily (Sept 29)  said USA will sell new, sophisticated radar systems and Cobra helicopters to Pakistan. The nation is astonished why we are buying these radars and choppers from US? We have seen how, in the last seven years, the planes and drones of US Air Force have been violating our airspace regularly. Not a shot has ever been fired upon these 'intruders'. What do we need these radars and choppers for? Flies? Birds? It is better we spent that money on social development. -BASHIR HUSSAIN AZAD, Chitral, via e-mail, September 30.