The SIDAM 25 [2] is a self-propelled anti-aircraft gun developed in Italy from the chassis of the American M113 armoured personnel carrier.

Beginning production in 1987, OTO Breda built a large turret to accommodate the four Oerlikon KBA cannons and remodeled the hull of the M113 slightly to provide side-access to the internal space of the vehicle by the addition of a side-mounted door.

An internal magazine also houses 40 APDS rounds that can be used against enemy vehicles.

The turret can rotate through 360° and the guns can be raised 87° or lowered 5° from the horizontal position.

[3] The SIDAM 25 is powered by a single 6-cylinder Detroit 6V-53 engine, which delivers 215 hp (160 kW) and drives the SIDAM 25 to a top road speed of 68 km/h (42 mph) and allows the vehicle to climb vertical obstacles of 0.6 m (2 ft) in height and climb gradients with a 60% incline and cross trenches up to 1.7 m (5 ft 7 in) wide.