Summary: Army Instructional film on the use of the .30 Browning machine gun from tanks and armoured fighting vehicles such as the Saladin armoured car. The use of the co-axially mounted machine gun fitted in the Centurion tank is demonstrated, including the observation of targets and correction of fire by the gunner or commander, allowing for range, type of target and terrain. The use of the Commander's turret-mounted .30 machine gun is also covered, both as an emergency and anti-aircraft weapon. The stabilisation system used in the Centurion tank to ensure accuracy while moving is mentioned briefly, and the correction of sights on a range described in more detail.