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The assistant secretary of defense for mission capabilities (ASD(MC)) is a position in the United States Department of Defense responsible for the overall supervision of mission capabilities, prototype testing, and the demonstration of "multi-domain" concepts.[1] The officeholder is the principal advisor to the under secretary of defense for research and engineering.
The position was created in 2023, under the leadership of Defense Secretary Lloyd Austin.[2]
In July 2025, President Donald Trump nominated James Caggy to the position.[1]