by both foreign and domestic political organizations, like the clandestine Portuguese Communist Party (PCP). Near the end of the conflict, a report by the British priest Adrian Hastings, alleging atrocities and war crimes on the part of the Portuguese military, was printed a week before the Portuguese prime minister Marcelo Caetano was due to visit Britain to celebrate the 600th anniversary of the Anglo-Portuguese alliance in 1973. Portugal's growing isolation following Hastings's claims has often been cited as a factor that helped to bring about the "carnation revolution" coup in Lisbon which deposed the Caetano regime in 1974, ending the Portuguese African counter-insurgency campaigns and triggering the rapid collapse of the Portuguese Empire. Guerrilla movements The armament of the nationalist groups came mainly from the Soviet Union, China, Cuba, Eastern Europe. However, they also used small arms of U.S. manufacture (such as the .45 M1 Thompson submachine gun), along with British, French, and German weapons came from neighboring countries sympathetic to the rebellion. Later in the war, most guerrillas would use roughly the same infantry rifles of Soviet origin: the Mosin–Nagant bolt-action rifle, the SKS carbine, and most importantly the AKM series of 7.62×39mm assault rifle, or Kalashnikov. Rebel forces also made extensive use of machine guns for ambush and positional defense. 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. The guerrillas' AKM rifles and such variants were highly thought of by many Portuguese soldiers, as they were more mobile than the m/961 (G3), while permitting the user to deliver a heavy volume of automatic fire at the closer ranges typically encountered in bush warfare. The AKM's ammunition load was also lighter. The average Angolan or Mozambican rebel could easily transport 150