11) Who wrote the iconic song "The Ballad of the Green Berets" about the Vietnam War?
12) How many US soldiers died in the Vietnam War?
13) What was the name of South Vietnam's leader during the Vietnam War?
14) What country borders Vietnam to the north?
15) What month is the Vietnamese New Year usually celebrated in?
16) What is the predominant religion of Vietnam?
17) What is the name of the longest river in Vietnam?
18) Which lake is located at the center of Hanoi?
19) What is the name of the currency used in Vietnam?
20) What is the largest city in Vietnam?