A squad automatic weapon (SAW, also known as section automatic weapon or light support weapon) is a weapon used to give infantry squads or sections automatic firepower that can easily be moved around. Weapons used for this are selective fire rifles. They usually have a bipod and a heavier barrel so that they can be used as light machine guns. SAWs usually fire the same cartridge as the assault rifles or battle rifles used by other people in the squad/section. This makes logistics easier because only one type of ammunition needs to be given to a unit. SAWs are light enough to be used by one man. However, heavy machine guns such as the Browning M2 are more powerful but need a crew to be as effective as they can be.