This document discusses lessons learned from India's pursuit of defense indigenization and self-reliance over several decades. It outlines six key lessons: 1) the vague definition of "Make in India" 2) the underperformance of state-owned defense companies 3) the challenges private companies face in entering the complex defense sector 4) limited success with foreign direct investment 5) ongoing difficulties of doing business in India 6) potential issues with newly planned defense industrial corridors. It argues a long-term, holistic plan is needed that includes industry training, public-private partnerships, clustering of firms, and earlier involvement of domestic companies in projects. The goal should be a sustainable defense industrial ecosystem.