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Congress

MOSA Implementation By Pentagon Lagging, GAO Official Says

Frank Wolfe

Wednesday, June 10th, 2026

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MOSA Implementation By Pentagon Lagging, GAO Official Says

Low angled view of the U.S. Capitol East Facade Front in Washington, DC.

While the Modular Open Systems Approach (MOSA) has been a requirement for major defense acquisition programs since January 2019 and other Defense Department acquisitions since January 2021, few programs are implementing the standard, according to a Government Accountability Office (GAO) official. For Pentagon systems, MOSA is to aid "iterative development" in which programs do not spend years designing systems and obligating billions at the outset of a contract to deliver specific, customized military requirements, but instead designing systems to desired…

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