The U.S. is concealing a longstanding program that retrieves and reverse engineers unidentified flying objects, a former Air Force intelligence officer testified Wednesday to Congress. The Pentagon has denied his claims. Retired Maj. David Grusch's highly anticipated testimony before a House Oversight subcommittee was Congress' latest foray into the world of UAPs — or “unidentified aerial phenomena," which is the official term the U.S. government uses instead of UFOs. While the study of mysterious aircraft or objects often evokes talk of aliens and “little green men,” Democrats and Republicans in recent years have pushed for more research as a national security matter due to concerns that sightings observed by pilots may be tied to U.S. adversaries. MORE: https://www.cbs8.com/article/news/nation-world/ufo-congress-hearings-whistleblower-claims-us-concealing-program-capturing-uaps/507-28e12ecb-89e8-487b-8061-72f50b3f7b95