The first group of americans sent by president eisenhower to assist the south vietnamese against communist forces were:

The first group of Americans sent by President Eisenhower to assist the South Vietnamese against Communist forces were military advisors.

Explanation:

Military advisers are members of the armed forces, who are sent by their government to other countries to train military or paramilitary units, to advise commanders or politicians, or to participate indirectly in combat operations.    

During the Cold War, both the United States and the Soviet Union used military aid and advisers to support and retain countries of their own blocs. This extended to massive support in so-called proxy wars. Unlike the United States, the Soviet Union delegated advisory services to friendly nations, which were given increased competence in extreme climates. At the behest of the Soviet Union, Cuba was advocating a large number of Africans, especially in Angola. The USA used military advisers in the early phase of the Vietnam War in a particularly extensive manner.