Facing the pressures of the Cold War, Kenyatta officially pursued a policy of "positive non-alignment". In reality, his foreign policy was pro-Western and in particular pro-British. Kenya became a member of the British Commonwealth, using this as a vehicle to put pressure on the white-minority apartheid regimes in South Africa and Rhodesia. Britain remained one of Kenya's foremost sources of foreign trade; British aid to Kenya was among the highest in Africa. In 1964, Kenya and the UK signed a Memorandum of Understanding, one of only two military alliances Kenyatta's government made; the British Special Air Service trained Kenyatta's own bodyguards. Commentators argued that Britain's relationship with Kenyatta's Kenya was a neo-colonial one, with the British having exchanged their position of political power for one of influence. The historian Poppy Cullen nevertheless noted that there was no "dictatorial neo-colonial control" in Kenyatta's Kenya.