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A US Navy FA-18 Super Hornet is seen from a KC-135 air refuelling tanker during 'Keen Sword', US-Japan military exercise above the South China sea on December 9, 2010. Around 10,500 US service members and their Japanese Self Defence Forces counterparts participated in the eight-day-long exercise which started on Decomber 3.    AFP PHOTO / TOSHIFUMI KITAMURA (Photo credit should read TOSHIFUMI KITAMURA/AFP/Getty Images)
A US Navy FA-18 Super Hornet is seen from a KC-135 air refuelling tanker during 'Keen Sword', US-Japan military exercise above the South China sea on December 9, 2010. Around 10,500 US service members and their Japanese Self Defence Forces counterparts participated in the eight-day-long exercise which started on Decomber 3.    AFP PHOTO / TOSHIFUMI KITAMURA (Photo credit should read TOSHIFUMI KITAMURA/AFP/Getty Images)

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    U.S. launches second round of airstrikes in Iraq

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U.S. launches second round of airstrikes in Iraq

Second round of air strikes in Iraq are to help defend the city of Irbil. CNN's Barbara Starr reports.

U.S. launches second round of airstrikes in Iraq

Second round of air strikes in Iraq are to help defend the city of Irbil. CNN's Barbara Starr reports.