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William S. Castle

Principal Deputy General Counsel

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William S. Castle, Esq., currently serves as Principal Deputy General Counsel, having been so appointed by the Secretary of Defense in August 2017.

Previously, Mr. Castle was Minority General Counsel to the Senate Armed Services Committee, Chief Counsel in Senator Orrin Hatch's Office of the Senate President Pro Tempore, and Senator Hatch’s Senior National Security Counsel.

Mr. Castle received his Bachelor of Arts in Political Science from Brown University in 1993 and his Juris Doctorate from the University of Pennsylvania Law School in 1999. His work has been published in the Harvard Journal of Law and Public Policy. Mr. Castle is admitted to practice law in New Jersey and the District of Columbia.