Amelio Robles Ávila (3 November 1889 – 9 December 1984) was a colonel during the Mexican Revolution. Assigned female at birth with the name Amelia Robles Ávila, Robles fought in the Mexican Revolution, rose to the rank of colonel, and lived openly as a man from age 24 until his death at age 95.
Alan L. Hart (October 4, 1890 – July 1, 1962) was an American physician, radiologist, tuberculosis researcher, writer and novelist. He was in 1917–18 one of the first trans men to undergo hysterectomy in the United States, and lived the rest of his life as a man. He pioneered the use of x-ray photography in tuberculosis detection, and helped implement TB screening programs that saved thousands of lives.
Many people have engaged in cross-dressing during wartime under various circumstances and for various motives. This has been especially true of women, whether while serving as a soldier in otherwise all-male armies, while protecting themselves or disguising their identity in dangerous circumstances, or for other purposes.