As a colonel, Aaron served as Commander, 5th Special Forces Group (Airborne) in Vietnam from June 4, 1968, to May 29, 1969, earning a third Bronze Star and two Air Medals. From November 5, 1973, to August 28, 1977, he served as the Assistant Chief of Staff for Intelligence, Headquarters, Department of the Army as a major general.[2][3] Aaron was later promoted to lieutenant general. He retired from active duty on January 31, 1979 after serving as deputy director of the Defense Intelligence Agency.[5]
Aaron married Marianne H. O'Donoghue on January 16, 1944 at St. Patrick's Cathedral in New York City.[6] They had three sons and four daughters. After his retirement from the Army, Aaron and his wife lived in Annandale, Virginia.[7]
^ ab"Class of June 1943—Register of Graduates". Register of Graduates and Former Cadets 1802–1971 of the United States Military Academy. The West Point Alumni Foundation Inc. 1971. p. 528. Retrieved December 20, 2022.
^ ab"Lieutenant General Harold R. Aaron"(PDF). Intelligence Knowledge Network. U.S. Army Intelligence Center of Excellence. December 18, 2014. Retrieved December 20, 2022.
^"Names in the News: Aaron Retires". Journal of the U.S. Army Intelligence & Security Command. Vol. 2, no. 5. March 1979. p. 15. Retrieved December 20, 2022.
^"Marrianne H. Aaron". Washington Times. November 7, 2012. Retrieved December 20, 2022.