sentences:  For additional firepower, the vehicles were often armed with twin AN/M2 aircraft machine guns (12.7×99mm) or modified British Hispano Mk.V 20mm autocannons taken from decommissioned Rhodesian Air Force de Havilland Vampire Mk9 single-seater fighter jets and mounted on a pintle fitted with a gun shield to protect the gunner.The design of the UR-416 provided the basis which inspired the Rhodesians to develop the more advanced and highly successful Mine Protected Combat Vehicle (MPCV) in 1978-79.The Rhodesian 'Pigs' were successfully tested in combat by a Selous Scouts' flying mini-column that raided two ZANLA camps on the Mapai area of southern Mozambique in October 1976 (Operation "Mardon") and later resumed the same role during the September 1979 raid on the ZANLA's New Chimoio base in Mozambique (Operation "Miracle") though their lack of mine-protection was found to be a major drawback.