From popular mechanics
"Just because some ammunition is made for practice doesn't mean it's not dangerous. For decades, soldiers in training have fired explosives like the M918 40-mm shell, which is less powerful than battlefield munitions, but still explodes to simulate the "bang" of a real round. However, a few of those old-style munitions—about 3 to 8 percent of current shells according to the Department of Defense—are duds that get stuck in the ground without exploding, creating a cleanup nightmare for the military. The Wall Street Journal reports that the bill to clean up all 10 million acres on 1400 different sites containing unexploded shells could cost about $20 billion. To skirt such pricey clean-ups, the military is turning to a new idea: "green" training ammunition."
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