Following an extremist insurgency in Iraq by the Islamic State of Iraq and the Levant against the Shi'ite-led government --<br/> <br />The Pentagon has sent the aircraft carrier USS George H.W. Bush into the Gulf as a preventative measure.<br/> <br />It's an order Defense Secretary Chuck Hagel hopes will provide the Commander-in-Chief flexibility -- a military option the Defense Department says is "required to protect American lives."<br/> <br />U.S. President Barack Obama, however, has said that he will not send U.S. troops back into combat in Iraq.<br/> <br />The aircraft carrier is among the largest in its class in the world.
