Amid the global movement towards sustainable energy sources, hydrogen is gaining prominence in the military sector. South Korea's military, in collaboration with top mobility technology companies like Kia, Hyundai, and Doosan, is actively transitioning to hydrogen engines for tanks and armored vehicles to combat carbon emissions. Hyundai's 'H-Moving Station' is designed to carry and refuel hydrogen efficiently for military use. The RoKA's decision to adopt hydrogen engines is driven by the higher efficiency of power generation compared to traditional fossil fuels, with hydrogen fuel cells offering a 47% efficiency rate or higher. Additionally, hydrogen fuel cells are advantageous due to their compact size, lightweight nature, and noise reduction benefits, contributing to enhanced stealth capabilities for the military. Apart from ground vehicles, companies like Paprity and Hogreen Air are also developing hydrogen engines for warships and submarines, further emphasizing the shift towards sustainable energy solutions in the defense industry. The move towards hydrogen-powered military equipment not only aims to combat global warming by reducing carbon emissions but also signifies a technological advancement benefiting both environmental conservation and military operations.