7.62×39mm cartridges (five 30-round magazines) on his person during bush operations, compared to 100 7.62×51mm rounds (five 20-round magazines) typically carried by a Portuguese infantryman on patrol. Though a common misconception holds that Portuguese soldiers used captured AKM type weapons, this was only true of a few elite units for special missions. Like U.S. forces in Vietnam, ammunition resupply difficulties and the obvious danger of being mistaken for a guerrilla when firing an enemy weapon generally precluded their use. Mines and other booby traps were one of the principal weapons used by the insurgents against Portuguese mechanized forces to great effect, who typically patrolled the mostly unpaved roads of their territories using motor vehicles and armored scout cars. To counter the mine threat, Portuguese engineers commenced the herculean task of tarring the rural road network. Mine detection was accomplished not only by electronic mine detectors, but also by employing trained soldiers (picadors) walking abreast with long probes to detect nonmetallic road mines. Guerrillas in all the various revolutionary movements used a variety of mines, often combining anti-tank with anti-personnel mines to ambush Portuguese formations with devastating results. A common tactic was to plant large anti-vehicle mines in a roadway bordered by obvious cover, such as an irrigation ditch, then seed the ditch with anti-personnel mines. Detonation of the vehicle mine would cause Portuguese troops to deploy and seek cover in the ditch, where the anti-personnel mines would cause further casualties. If the insurgents planned to confront the Portuguese openly, one or two heavy machine guns would be sited to sweep the ditch and other likely areas of cover. Other mines used included the PMN (Black Widow), TM-46, and POMZ. Even amphibious mines were used such as the PDM, along with numerous home-made antipersonnel wood box mines and other nonmetallic explosive devices. The impact of mining operations, in addition to causing casualties, undermined the mobility of Portuguese forces, while diverting troops and equipment from security and offensive operations to convoy protection and mine clearance missions. In general, the PAIGC in Guinea was the best armed, trained and led of all the guerrilla movements. By 1970, it even had candidates training in the Soviet Union, learning to fly Mikoyan-Gurevich MiG-15 jets and to operate Soviet-supplied amphibious assault crafts and APCs. Opposition in Portugal The government presented as a general consensus that the colonies were a part of the national unity, closer to