Khu vực 51 thực chất là nơi thử nghiệm máy bay của Không quân Mỹ. Đây là lý do căn cứ quân sự này được chính phủ giữ tuyệt mật.
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Đầu những năm 1950, không quân Mỹ thực hiện nhiệm vụ trinh sát tầm thấp trên bầu trời Liên Xô. Nhưng có những lo lắng về việc máy bay bị phát hiện và bắn hạ.Năm 1954, Tổng thống Mỹ Eisenhower khởi động dự án Aquatone, với mục tiêu phát triển loại máy bay trinh sát mới. Chương trình yêu cầu một địa điểm mà người dân hoặc gián điệp tình báo khó tiếp cận và Khu vực 51 là lựa chọn hoàn hảo.Khu vực 51 nằm ở sa mạc Nevada, gần cánh đồng muối Groom Lake. Một giả thiết cho rằng tên gọi của căn cứ quân sự này liên quan đến Ủy ban Năng lượng Nguyên tử – đơn vị đã chia sa mạc Nevada thành nhiều bãi thử hạt nhân khác nhau và đánh số thứ tự.Mùa hè năm 1955, một số người đã cáo báo về “vật thể bay không xác định” xung quanh Khu vực 51. Thực chất, đó là máy bay U-2 mà Không quân Mỹ đang thử nghiệm.U-2 có thể bay cao hơn 18 km. Vào thời điểm đó, máy bay dân dụng thường nằm trong phạm vi 3-6 km, thậm chí máy bay quân sự hàng đầu cũng chỉ đạt 12 km.Nếu một phi công máy bay dân dụng nhìn thấy U-2 ở phía trên, họ sẽ không biết nó là gì và báo cáo về trạm không lưu. Đó là nguồn cơn của những lời đồn đại về UFO.Trong khi Không quân Mỹ biết rõ “vật thể bay không xác định” chỉ là U-2, họ không thể nói điều này cho công chúng. Các quan chức giải thích đó là “hiện tượng tự nhiên” và “nghiên cứu thời tiết trên cao”.Việc thử nghiệm U-2 đã kết thúc vào cuối những năm 1950, nhưng Khu vực 51 vẫn tiếp tục nhiệm vụ của nó qua nhiều đời máy bay, bao gồm F-117A, A-12 và TACIT BLUE.Chính phủ đã không thừa nhận sự tồn tại của căn cứ quân sự này cho đến năm 2013. Hiện tại, nếu ghé thăm phi trường Las Vegas, bạn có thể bắt gặp một số máy bay nhỏ không nhãn hiệu – đó là chuyến bay đưa nhân viên Khu vực 51 đến nơi làm việc.
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