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Making the case for MOSA

November 20, 2025

Six years have passed since the tri-service memo was issued by the Air Force, Army, and Navy leadership mandating the use of a modular open systems approach (MOSA) in all new programs and technology refreshes. Many in the defense community were already embracing MOSA strategies and leveraging open standards, but having the three services mandate it promised faster adoption. Update: It’s happening. MOSA is already the law and now defense secretary Pete Hegseth is dictating a MOSA approach as part of his efforts to reform and speed up the defense acquisition process.