The hat apparently was named after William J. Hardee, a career officer in the U.S. Army from 1838 until resigning his commission on January 31, 1861. Hardee was Commandant of Cadets at West Point from 1856 to 1860. He was lieutenant colonel of the 1st U.S. Cavalry until just before the war. In 1855, he published Rifle and Light Infantry Tactics for the Exercise and Manoeuvres of Troops When Acting as Light Infantry or Riflemen, popularly known as Hardee's Tactics, which became the best-known drill manual of both sides of the Civil War. He joined the Confederate States Army in March 1861 and eventually became a lieutenant general and corps commander.