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美国阿拉斯加州艾尔森空军基地，红旗-阿拉斯加 07-1 联合空战演习中，美国空军第28轰炸机联队（南达科他州埃尔斯沃思空军基地，28BW）一架 B-1B 轰炸机启动引擎。（A B-1B Lancer aircraft starts its engine during Red Flag-Alaska 07-1 at Ellsworth Air Force Base, S.D., April 13, 2007. Red Flag-Alaska is a Pacific Air Forces-directed field training exercise for U.S. forces flown under simulated air combat conditions c onducted on the Pacific Alaskan Range Complex with air operations flown out of Eielson and Elmendorf Air Force Bases.）

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