From the Academy-Award nominated film, Full Metal Jacket, is this scene from the Marine boot camp basic training. Gunnery Sergeant Hartman is a real tough act, but he is fair. In this scene, he drills into the recruits the difference between a "rifle" and a "gun." So you will never hear a member of the US Armed Services refer to their rifle as their "gun." They refer to their pistol as their sidearm, but they also do not call their pistol a "gun." So in this scene, Gunnery Sergeant Hartman has them parading up and down the barracks chanting "This is my rifle, this is my gun, this is for fighting, this is for fun." A memorable scene in a movie full of them.