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- Vietnam War, 1961-197595
- Missing in action48
- Foreign relations47
- Prisoners and prisons28
- History19
- Prisoners of war18
- Politics and government12
- Aerial operations, American8
- Prisoners and prisons, North Vietnamese8
- Search and rescue operations5
- United States. Central Intelligence Agency5
- War5
- Military assistance, American4
- United States4
- United States. Air Force4
- Air America3
- Casualties3
- Human rights3
- Termination3
- American2