The M79 is a single-shot, break-action grenade launcher developed by the United States in the early 1960s. It fires 40mm grenades and is designed for infantry use, providing soldiers with a lightweight and portable option for delivering explosive firepower. The M79 became widely used during the Vietnam War, where it proved effective in various combat situations. The weapon features a smoothbore barrel and is typically loaded with a variety of grenades, including high-explosive and smoke rounds. Its design allows for quick reloading and ease of use, making it a valuable asset for ground troops. The M79 is often associated with the Vietnam War and has influenced the development of other grenade launchers, such as the M203.