Clark McAdams Clifford (December 25, 1906 – October 10, 1998) was a highly influential American lawyer who served United States Presidents Harry S. Truman, John F. Kennedy, Lyndon B. Johnson and Jimmy Carter, serving as United States Secretary of Defense for Johnson.

Clifford was born in Fort Scott, Kansas. He attended college and law school at Washington University in St. Louis, Missouri, and built a solid reputation practicing law in St. Louis between 1928 and 1943.

He served as an officer in the U.S. Navy from 1944 to 1946, reaching the rank of captain and serving as assistant naval aide and then naval aide to President Truman, for whom he became a trusted personal adviser and friend.

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