While the Obama administration insists that any U.S. military strike on Syria would not involve the use of American ground troops, the Defense Department has quietly planned for that possibility, according to a senior defense official. "It would be irresponsible not to have such a plan, but it's not one we're taking off the shelf right now," the senior defense official told InsideDefense.com . The department has steered clear of publicly discussing such planning in light of the administration's pledge...