DRDO undertakes projects in four different categories. These are: Mission Mode (MM), Technology Demonstration (TD), Science and Technology (S&T), and Infrastructure (IF) development. In the recent past, a fifth category, viz., Product Support (PS) has been added to cater to the activity relating to productionisation/transfer of technology (ToT) and limited upgrades. DRDO works with a financial allocation of about 5.2 per cent of the country’s defence budget which is very modest in comparison to established global leaders like USA, UK, Israel, etc. DDR&D’s budget over the years.