SpaceX’s plans to retire its most popular rocket could jeopardize the United States’ ability to launch military satellites — a plight compounded by the Pentagon’s dependence on Elon Musk’s company.

SpaceX is by far the dominant player in the rocket business and indispensable to the military, dwarfing competitors and accounting for 85% of U.S. launches in 2025. The company is phasing out its Falcon 9 rocket to make way for Starship, a massive new vehicle that SpaceX says will be more efficient and profitable, but which many military satellites aren’t designed to fit.

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The Space Force has said it’s open to eventually using SpaceX’s Starship. But there are engineering challenges to overcome because Starship is designed for “flat stack” satellites such as Starlink, while most military satellites are designed for a larger cargo bay.…