兰德：不是X文件-绘制美国各地不明飞行现象的公开报告（英文版）

The U.S. government is responsible for an estimated 5.3 million square miles of domesticairspace and 24 million square miles of oceanic airspace. The February 2023 downing of aChinese surveillance balloon after it had flown across the country raised questions about thedegree to which the U.S. government knows who is flying what over its territorial skies. Likeall countries, the United States has finite resources to monitor objects flying through its airspace.At the same time, advances in tech