Was the U. S successful in the vietnam war in protecting national interests?

yes

Explanation:

The role of the United States in the Vietnam War began after World War II and escalated into full commitment during the Vietnam War from 1955 to 1973. ... Eventually, U.S. missions were carried out at a more consistent rate by sending out increasing amounts of military assistance from the United States.

explanation:

may i ask what challenges?

i believe that the answer to the question provided above is that the role of campaign committees is to act as a bridge between state and local campaigns.