Usually, tanks carry smaller caliber armament for short-range defense where fire from the main weapon would be ineffective or wasteful, for example when engaging infantry, light vehicles or close air support aircraft. A typical complement of secondary weapons is a general-purpose machine gun mounted coaxially with the main gun, and a heavier anti-aircraft-capable machine gun on the turret roof. Some tanks also have a hull-mounted machine gun. These weapons are often modified variants of those used by infantry, and so use the same kinds of ammunition.
Usually tanks carry smaller caliber armament for short-range defense where fire from the main weapon would be ineffective or wasteful for example when engaging infantry light vehicles or close air support aircraft A typical complement of secondary weapons is a general-purpose machine gun mounted coaxially with the main gun and a heavier anti-aircraft-capable machine gun on the turret roof Some tanks also have a hull-mounted machine gun These weapons are often modified variants of those used by infantry and so use the same kinds of ammunition