William Westmoreland served as the commander of American military operations in Vietnam during which period?

• A. 1960 to 1964
• B. 1966 to 1970
• C. 1962 to 1966
• D. 1964 to 1968

Answer: (D)

The period tested is the time William Westmoreland led American military operations in Vietnam as commander of MACV. He took command in 1964, after the Gulf of Tonkin incidents, and remained in that role through 1968, when Creighton Abrams succeeded him. During this span, U.S. involvement intensified into a major ground war and Westmoreland oversaw the shift to an attrition-style strategy with large-scale deployments and search-and-destroy operations. The other date ranges don’t fit because they start earlier or end earlier or later than his actual tenure.