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美国阿拉斯加州艾尔森空军基地，红旗-阿拉斯加 13-3 联合空战演习中，美国陆军 UH-60L 直升机准备降落到着陆区。(A Black Hawk helicopter lands in the drop zone Aug. 19, 2013, to pick up Army and Air Force troops for transport during Red Flag - Alaska at Eielson AFB. Red Flag - Alaska is joint base air combat exercise where participating U.S. and coalition forces refine combat skills in a realistic threat environment.)

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