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The command told Military.com that a "factory-packed box" consisting of two cans with 100 rounds each of .50 caliber ammunition currently weighs 77 pounds -- a significant load for troops to shoulder.

The Marine Corps is exploring whether it could buy significantly lighter 0.50 caliber ammunition, ... Now, a box of two cans of 100 rounds each weighs a total of 77 pounds, Blackstock said.

Inside the boxes: drab green steel cans of .50-caliber ammunition. Each round was giant, more than 5 inches long, built to be fired from a gun so big it is typically bolted to a truck.