R. Lee Ermey was an American actor and former Marine Corps drill instructor, best known for his role as Gunnery Sergeant Hartman in the film Full Metal Jacket. Born on March 24, 1944, in Emporia, Kansas, he served in the Vietnam War and later became a prominent figure in military-themed entertainment. In addition to his acting career, Ermey hosted the television series Mail Call, where he answered questions about military history and equipment. He was recognized for his distinctive voice and commanding presence, which made him a popular figure in both film and television until his passing on April 15, 2018.