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"The only justification for putting boots on the ground is if you want to make sure that Iran never controls the Strait of Hormuz," Panetta said.
"When I was secretary of defence, [we concluded] you've got to have enough troops to cover 50 miles on each side of the Strait of Hormuz and 100 miles further in to control that entire area. There will be casualties as a result of that kind of effort."
He said there was no support in the US for a mission of that kind " which could require about 200,000 troops " either in Congress or among the American people.