Qualification issues include design and testing required to maintain the combat capabilities of the UH-60 Black Hawk and the safe flight envelope of the aircraft with the tank.

该机的设计难点在于用户要求既要保持UH-60原有的攻击运输能力，又要在携带外部大型水箱的情况下保持飞行安全。

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"Two UH-60 Black Hawk helicopters were on a night operation when one of the aircraft crashed, " the military said.

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Later, Hagel was flown in an Israeli Army UH-60 Black Hawk helicopter over northern Israel to view the Golan Heights, an area along the Syrian border that Israel captured during the 1967 Six-Day War.

NPR: Hagel: US Committed To Israel's Military Edge