During his work on behalf of the US Air Force and NASA, Strughold was the subject of three separate US government investigations into his suspected involvement in war crimes committed under the Nazis. A 1958 investigation by the Justice Department fully exonerated Strughold, while a second inquiry launched by the Immigration and Naturalization Service in 1974 was later abandoned due to lack of evidence. In 1983 the Office of Special Investigations reopened his case but withdrew from the effort when Strughold died in September 1986.
