The US President Gerald Ford wanted to involved in conflicts in Vietnam and Angola because he didn't wanted it to fall to the communists.
He was the US President from 1974 to 1977, his tenure saw the end of decades long vietnam war. He followed the same foreign policy which Nixon was following, that is to curtail the growing power of USSR. To some extent he was successful in curtailing Soviet Union geopolitical role.
As per the question, Gerald Ford has the ideology which was against communist and Soviet Union. Hence the correct answer would be that he did not wanted Vietnam and Angloa to fall in the hands of communist government.
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