Indian Navy (IN) has inducted, indigenously made 6,800-tonne destroyer INS Kolkata. The Rs 11,662 crore Project “15A” to build INS Kolkata and two follow-on destroyers (INS Kochi and INS Chennai), being undertaken at the Mazagon Docks. Once the construction of these three destroyers was over, the plan was to launch Project-15B to build four guided missile stealth destroyers.