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Although some sources list Heintzelman in a list of baseball players that served in Vietnam, no reliable sources found as of yet state that he actually served in Vietnam during the war. It is possible that the list also included those who served in the Vietnam Era. Accordingly, Category:American military personnel of the Vietnam War was removed from the article. Also, there are also no sources found as of yet that states what military service he served in. Semper Fi! FieldMarine ( talk) 11:05, 1 November 2018 (UTC) reply