Castelion bets on speed to rebuild America’s defense base

The brief

Castelion CEO Bryon Hargis argues that rebuilding America’s defense-industrial capacity is central to deterrence, especially as potential adversaries expand manufacturing.

Drawing on SpaceX and Elon Musk, Hargis advocates simplifying systems before automating them, integrating more production internally, and giving engineers ownership from requirements through manufacturing.

The company treats customer feedback as a product-development input, but not a command: technical teams must understand the underlying need rather than implement every request literally.

Hargis says hiring is the highest-leverage function, even when leaving a role vacant creates short-term pain; the wrong person can damage a young company far more.

The founding story turns on nearly one hundred investor rejections, followed by early backing from BlueYard and a fundraising shift after Andreessen Horowitz invested.

Project Ranger, Castelion’s effort to build a large hypersonics facility in New Mexico, captures the remaining test: turning a promising defense startup into a production-scale prime.