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In August 1952 he assumed command of the attack transport Sanborn, which conducted landing exercises at Vieques, Puerto Rico and Onslow Beach, North Carolina as part of Amphibious Force, Atlantic Fleet.
In 1919, as senior officer for the U.S. Naval Forces in Bermuda, he commanded the Azores detachment of the Atlantic Fleet that stood guard for the Navy flying boat NC-4 on its historic first trans-Atlantic crossing by an aircraft.
After being selected for flag rank, Clark commanded Carl Vinson Battle Group/Cruiser Destroyer Group Three, Second Fleet, and United States Atlantic Fleet.
After serving for four years as an enlisted journalist with the U.S. Navy's Atlantic Fleet, he studied at the Sorbonne from 1955 to 56.