Rapid-fire arms in use with the insurgents included the 7.62×54mmR DP-28, the 7.62×39mm RPD machine gun (the most widely used of all), the 8×57mm Mauser MG 34 general-purpose machine gun, together with the 12.7×108mm DShK and the 7.62×54mm SG-43 Goryunov heavy machine guns, 7.62×25mm PPSh-41 and PPS-43, 9×19mm Sa vz. 23, Sterling, MP 40, MAT-49 submachine gun operation. Support weapons included mortars, recoilless rifles, and in particular, Soviet-made rocket launchers, the RPG-2 and RPG-7. Anti-aircraft (AA) weapons were also employed, especially by the PAIGC and the FRELIMO. The 14.5×114mm ZPU AA cannon was the most widely used, but by far the most effective was the Strela 2 missile, first introduced to guerrilla forces in Guinea in 1973 and in Mozambique the following year by Soviet technicians.