What is MOSA? A Perspective from the Army’s New Tiltrotor

September 26 2025

The first MV-75 FLRAA virtual prototype delivered to the U.S. Army in June 2025. Source —U.S. Army.

With any time spent in the U.S. defense world, you’re bound to come across the buzzy acronym, MOSA. But what does it mean, and why does it matter? Strictly speaking, MOSA stands for Modular Open Systems Architecture. Broadly, it’s a strategic initiative designed to foster a more competitive, innovative marketplace, while improving adaptability and interoperability across defense...

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