Region
- United States 51 results
- Iraq 5 results
- Afghanistan 3 results
- Developing countries 3 results
- South Vietnam (1954-1975) 3 results
- Thailand 3 results
- Laos 2 results
- North Dakota 2 results
- Northern boundary of the United States 2 results
- Africa 1 results
- Cambodia 1 results
- District of Columbia 1 results
- Indochina 1 results
- Latin America 1 results
- Zimbabwe 1 results