Using intelligent manufacturing, automation powered by artificial intelligence, and quantum computing, Industry 6.0 is transforming the automotive, aerospace, defense, and military sectors. The revolutionary effects of improved materials, AI-powered decision-making, additive manufacturing, and real-time process control in next-generation vehicle and military systems are examined in this book chapter. Carbon nanotube-reinforced polymers, high-entropy alloys, and polyether ketone are examples of high-performance thermoplastics that are optimizing material qualities for applications requiring high strength and low weight. While quantum computing allows for sophisticated simulations for materials science and aerodynamic design, the use of AI-driven adaptive manufacturing increases efficiency by lowering waste and energy usage. AI-controlled trajectory correction is used by autonomous systems in the defense industry, such as military drones and hypersonic fighter jets, to improve accuracy and operational efficiency. Cyber physical security is strengthened by quantum cryptography, which guarantees the integrity of defense supply chains and autonomous weapon systems. Sustainable aviation fuels are helping the aerospace sector cut carbon emissions, and AI-driven predictive maintenance prolongs the life of armored vehicles and airplanes while minimizing downtime. To cut expenses and pollution, the automobile industry is quickly implementing electrified cars and AI-optimized supply networks. The aerospace and defense industries are seeing notable growth, according to market trends. The chapter lays out the route to completely autonomous and sustainable military and transportation ecosystems by offering a thorough analysis of next-generation materials, intelligent automation, and cyber-secure manufacturing.