Region
United States
36
Afghanistan
7
Syria
5
Colombia
4
Iraq
3
Latin America
3
Nigeria
3
Ukraine
3
Africa
2
Arab countries
2
Asia, Central
2
Israel
2
Panama
2
Panama Canal (Panama)
2
Russia (Federation)
2
Africa, Southern
1
Argentina
1
Azerbaijan
1
Canal Zone
1
Caribbean Area
1
Central America
1
China
1
Europe
1
Former Soviet republics
1
Great Britain
1
Indian Ocean Region
1
Indo-Pacific Region
1
Iran
1
Kazakhstan
1
Middle East
1
Soviet Union
1
Sri Lanka
1
Turkey
1
Yemen (Republic)
1
Yemen, North
1
Yemen, South
1
Zimbabwe
1