Micro-optics are critical in security and defense, enhancing the precision, efficiency, and functionality of advanced optical systems. In surveillance and reconnaissance, micro-optics enable high-resolution imaging and thermal detection for use in drones, satellites, and night-vision devices. They are also essential in laser targeting systems, improving accuracy and range in both offensive and defensive applications. In secure communication, micro-optics facilitate the development of quantum encryption technologies, providing robust protection against cyber threats. Additionally, they contribute to authentication and anti-counterfeiting measures through optical security features like holograms and diffractive elements. By leveraging micro-optics, security and defense technologies achieve greater reliability and performance in challenging environments.