The M249 SAW (Squad Automatic Weapon) is a light machine gun used by the United States military and other armed forces. It is designed to provide infantry units with a high volume of fire to support ground operations. The weapon is gas-operated and can fire both linked ammunition and standard magazines. The M249 SAW typically fires the 5.56×45mm NATO cartridge, allowing for effective engagement of targets at ranges up to 1,000 meters. It can be operated in both automatic and semi-automatic modes, making it versatile for various combat situations. The weapon is often mounted on vehicles or used by soldiers in a squad.