(FILES) A picture taken on April 18, 2010 shows US-made F-4 Phantom fighter jets flying during the Army Day parade in the Iranian capital Tehran. Iranian fighter jets struck Islamic State militants in eastern Iraq in recent days, the Pentagon said on December 2, 2014, signaling Tehran’s determination to confront the jihadists and Washington’s tacit partnership with arch-foe Iran. Iran acquired its F-4 fighters from the United States before the 1979 revolution that toppled the country’s pro-US monarchy. AFP PHOTO/BEHROUZ MEHRI