Region
United States
454
Colorado
45
California
13
Mexican-American Border Region
11
Alaska
10
Mexico
10
Arizona
4
Maryland
4
North America
4
Aberdeen Proving Ground
3
Aberdeen Proving Ground (Md.)
3
China
3
Contra Costa County
3
Fort Gordon (Ga.)
3
Georgia
3
New Jersey
3
New Mexico
3
New York (State)
3
South Carolina
3
Alabama
2
Ascensión (Chihuahua)
2
Columbus
2
Developing countries
2
Europe
2
Fort Gordon
2
Jordan River
2
Karshi-Khanabad Air Base
2
Karshi-Khanabad Air Base (Uzbekistan)
2
Loma Prieta
2
Oregon
2
Pinewood
2
San Francisco Bay Area
2
San Joaquin Valley
2
Texas
2
Utah
2
Uzbekistan
2
West (U.S.)
2
Aberdeen Region
1
Adams County
1
Agua Prieta (Sonora)
1
Alberta
1
Albuquerque
1
Anchorage Region
1
Anniston
1
Bettles Field Region
1
Buffalo Region
1
Canada
1
Charleston
1
Ciudad Acuña
1
Clear Creek (Clear Creek County)
1
more ...