In 1998 Teresa Fazio signed up for the Marine Corps' ROTC program to pay her way through MIT. After the United States was attacked on September 11, 2001, leading to the War on Terror, she graduated with a physics degree into a very different world, owing the Marines four years of active duty. At twenty-three years old and five-foot-one, Fazio was the youngest and smallest officer in her battalion; the combined effect of her short hair, glasses, and...