先端航空宇宙脅威特定計画
https://www.nytimes.com/2020/07/23/us/politics/pentagon-ufo-harry-reid-navy.html 2020年7月23日閲覧。
↑ Chow, Denice (2021年5月19日). “UFOs are about to make their way to the U.S. Senate. Here's what to know.”. nbcnews.com. https://www.nbcnews.com/science/science-news/ufos-are-make-way-us-senate-know-rcna973 2021年5月19日閲覧。
↑ Overbye, Dennis (2017年12月29日). “U.F.O.s: Is This All There Is?”. The New York Times. https://www.nytimes.com/2017/12/29/science/ufos-aliens-space-travel.html 2017年12月30日閲覧。
1 2 Mellon, Christopher (2018年3月9日). “The military keeps encountering UFOs. Why doesn't the Pentagon care? – We have no idea what's behind these weird incidents because we're not investigating.