Lok Sabha Speaker Om Birla on Thursday said cross-border terrorism has become a global menace and modernisation of defence capabilities is the need of the hour to tackle new challenges. Addressing the 63rd course members of the National Defence College (NDC), New Delhi in the Parliament complex, Birla said India has a rich and enduring heritage of military strategy."India today is making a significant contribution to global progress, development, prosperity, peace and stability. At a time when the national security scenario is becoming complex, cross-border terrorism has become a global challenge," he said.