According to Wiki, the 2010 U.S. penny had a mass of 2.5 grams.
Two point five grams x 100,000,000 = 250,000,000 g = 250,000 kg = 250 metric tonnes.
That is ~253.013 U.S. tons or ~246.063 U.K. long tons (You see? This nonsense is why the average American should see the light about Metric. Your military uses it... heck, even drug smugglers prefer to use metric units for measuring the illicit narcotics. In metric, I went from grams to tonnes just using factors of 10...)
One Final Note: I was **NOT** equating drug cartels and smuggles with the U.S. military.
Ok that was easy math,now how much would they weigh?