Walter S. McAfee (September 2, 1914 – February 18, 1990) was an African-American scientist and astronomer, notable for participating in the world’s first lunar radar echo experiments with Project Diana.

McAfee graduated from Portland Community College in 1934, and received an MS at Ohio State University in 1937. He subsequently took a job in 1939 teaching physics in Columbus, Ohio.

He enrolled at the Electronics Research Command at Fort Monmouth, New Jersey, in May 1942, and it was here that he participated in Project Diana.

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