Defense technology startup Onebrief has successfully raised $50 million in a Series C funding round, co-led by General Catalyst, which now values the company at $650 million. The funding announcement coincides with the appointment of Chris Miller, a former Pentagon leader and co-author of Project 2025, to Onebrief's board. The company aims to enhance military planning and decision-making processes, positioning itself to secure more government contracts through this financial boost. General Catalyst emphasized the importance of modernizing strategic military operations, stating that Onebrief helps military staff 'plan at the speed of war.'