Elite U.S. Army pilots like to boast that their helicopters’ night-vision equipment and other sensors allow them to “own the night,” but their engines now stop them from owning the high ground.  Nearly half of Afghanistan’s mountainous terrain on hot days rises above the pressure altitude hover limit for a combat-loaded Sikorsky UH-60 or Boeing AH-64. The empty weight of the UH-60 has steadily crept higher over the years, so the number of utility helicopters ...


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