1. Southeast Asia Treaty Organization (SEATO)

2. Kent State

3. Vietnamization

4. USA

5. USA

6. Ho Chi Minh Trail

7. My Lai

8. Tonkin Gulf Resolution

9. Tet Offensive

10. Agent Orange

11. The body count

12. China, France, and Japan

13. Post-traumatic-stress-disorder

14. Operation Rol ling Thunder

15. Paris

16. Domino Theory