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▤ Summary

Y Combinator highlights 18 defense startups in its June 2026 roundup. The group spans rocket cargo, counter-drone sensing, defense contracting automation, autonomous strike systems, underwater drones, simulation infrastructure, and AI-enabled surveillance. Several companies already show traction with military customers, prototype shipping, contracts, or active collaboration with defense organizations. The page functions as a directory-style overview of emerging defense software and hardware companies rather than a single news event.

▦ Linked Companies