A still image captured from U.S. Navy video shows U.S. Navy Ordnancemen aboard the aircraft carrier USS George H.W. Bush building GBU-54 500-pound bombs in the Arabian Gulf on August 9, 2014 in this ... more 
A still image captured from U.S. Navy video shows U.S. Navy Ordnancemen aboard the aircraft carrier USS George H.W. Bush building GBU-54 500-pound bombs in the Arabian Gulf on August 9, 2014 in this video released on August 11, 2014. A series of U.S. 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. REUTERS/Preston Paglinawan/U.S. Navy/Handout via Reuters (MID-SEA - Tags: MILITARY CONFLICT) FOR EDITORIAL USE ONLY. NOT FOR SALE FOR MARKETING OR ADVERTISING CAMPAIGNS. THIS IMAGE HAS BEEN SUPPLIED BY A THIRD PARTY. IT IS DISTRIBUTED, EXACTLY AS RECEIVED BY REUTERS, AS A SERVICE TO CLIENTS less 
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Reuters | Photo By HANDOUT / REUTERS
Mon, Aug 11, 2014 5:12 PM EDT