What is the nickname of the character played by Vincent D'Onofrio in the film 'Full Metal Jacket'?

Full Metal Jacket is a 1987 British-American war film directed and produced by Stanley Kubrick. The screenplay by Kubrick, Michael Herr, and Gustav Hasford was based on Hasford's novel The Short-Timers (1979). Its storyline follows a platoon of U.S. Marines through their training, primarily focusing on two privates, Joker and Pyle, who struggle to get through camp under their foul-mouthed drill instructor, Gunnery Sergeant Hartman, and the experiences of two of the platoon's Marines in the Tet Offensive during the Vietnam War. The film's title refers to the full metal jacket bullet used by soldiers. The film was released in the United States on June 26, 1987.

Vincent D'Onofrio played the part of Private Leonard "Gomer Pyle" Lawrence, an overweight, slow-witted recruit who becomes the focus of Hartman's attention. D'Onofrio was required to gain 70 pounds (32 kg), which broke the record for the largest weight gained for a role, set by Robert De Niro for Raging Bull.