Sailors conduct flight operations aboard the U.S. Navy Nimitz-class aircraft carrier USS Carl Vinson in the western Pacific Ocean May 2, 2017. Picture taken May 2, 2017. U.S. Navy/Mass Communication Specialist 2nd Class Sean M. Castellano/Handout via REUTERS FOR EDITORIAL USE ONLY. NOT FOR SALE FOR MARKETING OR ADVERTISING CAMPAIGNSTHIS IMAGE HAS BEEN SUPPLIED BY A THIRD PARTY. IT IS DISTRIBUTED, EXACTLY AS RECEIVED BY REUTERS, AS A SERVICE TO CLIENTS