Question

The Vietnam syndrome is _____.
the fear that other countries will fall to communists
depression and flashbacks after fighting in the war
opposition to U.S. involvement in a long military commitment
support for new opportunities for military victories

Answer 1

Generally speaking, the Vietnam syndrome is "opposition to U.S. involvement in a long military commitment," since Vietnam proved to be such a long and costly war. 

Answer 2

Answer:

Opposition to U.S. involvement in a long military commitment.

Explanation: