How did my mother serve in the Marine Corps during WWII?"In 1918, the Secretary of Navy allowed women to enroll for clerical duty in the Marine Corps. Officially, Opha Mae Johnson is credited as the first woman Marine. Johnson enrolled for service on August 13, 1918; during that year some 300 women first entered the Marine Corps to take over stateside clerical duties from battle-ready Marines who were needed overseas. The Marine Corps Women's Reserve was established in February 1943. June 12th, 1948, Congress passed the Women's Armed Services Integration Act and made women a permanent part of the regular Marine Corps. "