Who was the first female Marine?

Opha Mae Johnson is recognized as the first female Marine, having enlisted in the United States Marine Corps on August 13, 1918, during World War I. Her enlistment marked a significant milestone in U.S. military history, as she became one of the first women to serve in a military role that had been traditionally reserved for men. This paved the way for future generations of women to serve in the Marine Corps and other military branches, contributing to the diverse and inclusive nature of the modern armed forces.

Opha Mae Johnson's enlistment came at a time when the military was beginning to recognize the value of women in supporting roles, which were essential during wartime. Although the other individuals mentioned played pivotal roles in various facets of history and civil rights, none hold the distinction of being the first female Marine—making Johnson the correct answer in this context.