FILE PHOTO: A B-52 Stratofortress, flown by Capt. Will Byers and Maj. Tom Aranda, prepares for refueling over Afghanistan during a close-air-support mission in this undated handout photo. U.S. Air Force/Master Sgt. Lance Cheung/Handout via REUTERS ATTENTION EDITORS – THIS IMAGE HAS BEEN SUPPLIED BY A THIRD PARTY. To match Special Report USA-CHINA/BOMBERS/File Photo