The green, metal box was stuffed inside a bright pink pillowcase and stashed in the bushes behind Christopher Zachery's house. He hauled it out for a better look.

Stenciled on the box: "Cartridges for weapons." Inside were 30 armor-piercing grenades.

"I was scared," said Zachery, who runs a construction company. And confused. How did these high-powered explosives end up in his southwest Atlanta backyard? Where did they come from?

Investigators determined the waylaid grenades were last seen eight month prior on an ammunition train that rolled out from Florida. Someone had stolen them somewhere on the rails to Pennsylvania, another example in an Associated Press investigation that shows how the military's vast supply chain is susceptible to theft.

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