Unexploded ordnance contaminates thousands of U.S. military sites worldwide.

Evidence

One study suggests that there may be sixteen thousand U.S. military sites worldwide containing unexploded ordnance. The Pentagon has challenged this precise figure but acknowledged that it could cost $14 billion or even “several times that much” to deal with the problem. — David Vine, Base Nation_ How U.S. Military Bases…, 394

Categorization

• corroborated: 2 independent passages support this claim — David Vine, Base Nation_ How U.S. Military Bases…, 394
• XREF: connects to: Nearly every military base contains toxic chemicals and hazardous waste. — David Vine, Base Nation_ How U.S. Military Bases…, 388; Dud cluster bomblets become de facto landmines that wreck civilian life — Rob Nixon, Slow Violence and the Environmentalism…, 683