A still image captured from US Navy cockpit video shows an F/A-18F Super Hornet assigned to the Fighting Black Lions of Strike Fighter Squadron (VFA) 213 in a mid-air refueling after launching from the aircraft carrier USS George H.W. Bush in the Arabian Gulf on August 10, 2014 in this video released on August 11, 2014. A series of US airstrikes since last week has slowed the operational tempo of the Islamic State, the militant group that has seized large parts of northern Iraq, but is unlikely to substantially weaken the group, the Pentagon said on Monday. [Photo/Agencies]