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In 1960 he was assigned to State Department's International Cooperation Administration, going to South American countries to teach "advanced counterinsurgency techniques." A. J. Langguth, a former New York Times bureau chief in Saigon, claimed that Mitrione was among the US advisers teaching Brazilian police how much electric shock to apply to prisoners without killing them.
From 1953-1956 he was assistant economic commissioner with the International Cooperation Administration in French Indo-China with accreditation in Saigon, Phnom Penh, and Vientiane.