George A. Custer had several nicknames, but which was not-so-secretly given him by his disgruntled post Civil War cavalry troops?

During his years on the Great Plains in the American Indian Wars, his troopers often referred to him with grudging admiration as "Iron Butt" and "Hard Ass" for his physical stamina in the saddle and his strict discipline, as well as with the more derisive "Ringlets" for his long, curling blond hair, which he frequently perfumed with cinnamon-scented hair oil.

Throughout his life he carried many nicknames. The first was one he gave himself during his childhood in New Rumley. Trying to pronounce Armstrong, young George could only manage to pronounce it as "Autie." His first girlfriend called him "bachelor boy." At West Point, the other cadets called him "Fanny" because of his curly hair. Just prior to the battle of Gettysburg, Custer was assigned the command of the Michigan Cavalry and given the rank of Brigadier General. He was 23 years old at the time and given the nickname "Boy General." The enlisted men under his command gave him the nickname "Iron Butt" because they thought he drove them to hard. More famously was the nickname given to him by the Indians: "Yellow Hair" because of his long blond hair.