During the 1970s, the Vietnam War continued to have profound impacts on U.S. foreign policy, domestic politics, and social attitudes. Key events during this period include the Pentagon Papers' publication in 1971, the end of U.S. involvement in the war in 1973, and the eventual fall of Saigon in 1975. The Vietnam War prompted significant anti-war movements and brought about changes in public perception towards government transparency and trust. Which of the following statements best describes a significant outcome of U.S. military engagement in Vietnam during this period?