Three men walk through a passageway in one of Cuba's hundreds of miles of secret tunnels built by the military to protect against a US. invasion, shown July 5. Although the tunnels are stocked with nearly half of Cuba's supply of tanks, anti-aircraft guns and other weapons, Gen. John Sheehan, commander of U.S. forces in the region, said that "the Cuban military does not present a threat to the United States or a threat to the region."
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