Economically, the Congo provided much-needed raw materials such as copper and rubber to the United Kingdom and the United States. Uranium from the colony was used to produce the first atomic bombs. At the same time, a large supply of the territory's industrial diamonds were smuggled to Nazi Germany with the complicity of Belgian business executives. The Congo also financially supported the Belgian government in exile. Militarily, Congolese troops of the Force Publique fought alongside British forces in the East African Campaign, and a Congolese medical unit served in Madagascar and in the Burma Campaign. Congolese formations also acted as garrisons in Egypt, Nigeria and Palestine.