The Comptroller and Auditor General (CAG) has said, a 30 per cent failure rate was found in the surface-to-air missiles Akash during testing and held that such deficiencies posed an operational risk during hostilities. <br/><br/>In a report tabled in the Lok Sabha yesterday, CAG said the strategic missile system procured from the state-run Bharat Electronics Ltd were deficient in quality. <br/><br/>The report said missile systems were to be installed at the six designated sites between 2013 and 2015. But till date, none of the missile systems procured at a cost of 3,619 crore rupees has been installed due to delay in execution of civil works at the sites concerned.