直升机在延庆山区上空飞行约1小时，并将采集到的画面传送给地面指挥部。
The helicopter hovered for an hour around the mountainous areas in Yanqing District and sent video images of the ground back to headquarters.
据美军负责监督服务训练和纪律指挥部的Martin Dempsey将军说，美军在其年度要求的直升机飞行员训练中还缺少约300名。
The U.S. Army is short of meeting its annual requirement to train helicopter pilots by about 300, says Gen. Martin Dempsey, who oversees the service’s Training and Doctrine Command.
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