Source: “Free A Man To Fight.” Bradford Evening Star and The Bradford Daily Record, 23 Aug. 1943, p. 6. https://www.newspapers.com/article/bradford-evening-star-and-the-bradford-d/136874908/

FREE A MAN TO FIGHT At the start of WWII, the only military jobs open to women were those of Army or Navy nurses. But because so many men were desperately needed for combat, each service branch soon admitted women to fill noncombat jobs. “Free a Man to Fight” became a popular slogan. Before long, thousands of women were in uniform, working for the military as parachute packers, postal workers, photographers, clerks, translators, radio operators, weather forecasters, cooks, truck drivers, typists and mechanics and at dozens of other jobs traditionally held by men.

Source: Kuhn, Betsy. “Free A Man To Fight.” Angels of Mercy, Atheneum Books for Young Readers, New York, NY, 1999, p. 32.