poor relations between the US and Guinea over the government's association with the soviet Union delayed SMP activates by a year environmental conditions also caused trouble with other American tools ex. dodge trucks ped-o-jet vaccination gun they were believed to achieve a level of speed and efficiency that would make the program's goal—smallpox eradication within 5 years, possible. These devices promised a near revolutionary change in concepts of mass vaccination often proved incapable of the job in the field, dirt would infiltrate the device damaging the inner walls. ¼ of all ped-o-jets became inoperable, causing a slowdown in operations Cold war The SMP staff relied on locals for solutions to as well as information about environmental challenges problems with migration of African groups The study of the movements of nomadic peoples to produce a campaign strategy aimed at vaccinating those nomadic groups who are thought to play a major role in smallpox transmission.