The US is worried BUT adds more firepower for an Iranian 'first strike'?

An 'Iranian first strike'! What bull! 

"... President Barack Obama, Defense Secretary Leon Panetta and other top officials have delivered a string of private messages to Israeli leaders warning about the dire consequences of a strike. The U.S. wants Israel to give more time for the effects of sanctions and other measures intended to force Iran to abandon its perceived efforts to build nuclear weapons.
Stepping up the pressure, Mr. Obama spoke by telephone on Thursday with Israeli Prime Minister Benjamin Netanyahu, and U.S. Gen. Martin Dempsey, chairman of the Joint Chiefs of Staff, will meet with Israeli military officials in Tel Aviv next week... ...
The U.S. and Iran, however, have taken steps in recent days apparently designed to ease tensions. Iran has agreed to host a delegation of United Nations nuclear inspectors this month. The U.S., meanwhile, has twice this month rescued Iranian sailors in the region's seas.
Covert efforts by Israel's intelligence service to prevent Tehran from developing nuclear weapons have been credited with slowing the program ...
The U.S. military is preparing for a number of possible responses to an Israeli strike, including assaults by pro-Iranian Shiite militias in Iraq against the U.S. Embassy in Baghdad, according to U.S. officials.
The U.S. believes its embassy and other diplomatic outposts in Iraq are more vulnerable following the withdrawal of U.S. forces last month. Up to 15,000 U.S. diplomats, federal employees and contractors are expected to remain in Iraq.
In large measure to deter Iran, the U.S. has 15,000 troops in Kuwait, and has moved a second aircraft carrier strike group to the Persian Gulf area.
It has also been pre-positioning aircraft and other military equipment, officials say..."