Opha May Johnson became a charter member of Belleau Wood Post No. 1 in 1919, the first post for female Marines.
In 1919, Opha May Johnson further solidified her pioneering status by becoming a charter member of the Belleau Wood Post No. 1, a landmark establishment being the first post for female Marine Corps reservists. This initiative was critical as it fostered a sense of community and support for women who had served in the Marine Corps Reserve during World War I. Johnson’s participation was vital in advocating for the recognition and contribution of women in military service, setting a precedent that validated women's roles in national defense.