GalacticOS is a hardened, Linux-based operating system engineered specifically for space-based defence and commercial applications where security cannot be compromised. Built on familiar Linux architecture for seamless integration with existing workflows, GalacticOS is truly plug-and-play - enabling contractors to make their operations quantum-secure without disrupting established processes or requiring extensive retraining. Leveraging NIST-approved post-quantum cryptographic standards, GalacticOS delivers quantum-resistant protection from the moment of boot, ensuring your space assets remain secure against both current and future quantum computing threats. With secure boot architecture and quantum-safe encryption embedded at the kernel level, GalacticOS provides defence contractors and space operators with a trusted foundation for mission-critical systems - from satellite communications to distributed space infrastructure.