A small Mongolian mare was bought from a Seoul thoroughbred track in 1952 by the U.S. Marines. Little did anyone know, Reckless the mare would become a legendary icon of American war heroism. Reckless was purchased to help a particular Marines unit haul heavy guns and artillery over Korea's rugged terrain. She was then thoroughly trained to carry artillery, duck for cover, withstand the noise of firing rifles, get on and off trailers, and more. In only one day of battle, Reckless made 51 trips carrying almost 5 tons of ammunition total, covering more than 35 miles (56.3 km). Reckless was promoted to sergeant in 1954, an honor never bestowed-before or since-on an animal. She gained staff sergeant status at the end of the Korean War, and by the end of her military career, she had received two Purple Hearts.