William J. Hartman
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William J. Hartman is a retired American lieutenant general who served as acting commander of United States Cyber Command, acting director of the National Security Agency, and chief of the Central Security Service from April 3, 2025 to March 16, 2026. He also served as deputy commander of United States Cyber Command from January 16, 2024 to March 16, 2026. Earlier in his career, he served as commander of the Cyber National Mission Force from August 2019 to January 2024. He is known for his roles leading U.S. military and intelligence cyber operations organizations.
Updated 7 August 2026
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