Obama officials decry Tehran’s culpability for U.S. troop deathsThe United States is engaged in a deadly but seldom mentioned proxy war with Iran. In a rare act of candor, two senior Obama administration defense officials have addressed the open secret of Iran’s active support for insurgent groups fighting U.S. troops overseas. Earlier this week, during a visit to Iraq, newly confirmed Secretary of Defense Leon Panetta strongly denounced Iranian support for increasingly violent Shiite militia groups in that country. “We are very concerned about Iran and the weapons they are providing to extremists here in Iraq,” he said. “We’re seeing...