From Strategy Page:
Smart bombs have led to far fewer bombs being dropped. This has led to many changes in the way wars are fought. Keep in mind that during the peak six years of the Vietnam war, 6.7 million tons of bombs were dropped. That was the same rate they were dropped during the major bombing campaigns of World War II. But in eight years of fighting in Afghanistan and Iraq, only 42,000 tons have been dropped. Thus, while in the past, a million tons were dropped a year, for the war on terror, less than 6,000 tons a year were dropped. That means a reduction of over 99 percent. Even when you adjust for the different number of U.S. troops involved, that's still over 97 percent fewer bombs dropped.
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My Comment: These stats are surprising .... and that is an understatement.