Spent shell casings from firing practice litter the desert of the U.S. Marine Corps' Air Ground Combat Center at Twentynine Palms, California. (AP/Reed Saxon)

U.S. Military World’s Largest Polluter – Hundreds Of Bases Gravely Contaminated

Producing more hazardous waste than the five largest U.S. chemical companies combined, the U.S. Department of Defense has left its toxic legacy throughout the world in the form of depleted uranium, oil, jet fuel, pesticides, defoliants like Agent Orange and lead, among other pollutants.