zipped across the sky over the middle east. retired navy commander david fravor described another incident near san diego to 60 minutes. it goes and just terms abruptly and starts mirroring m. as i m going down, it starts coming up. i think there are a lot of questions that the american public needs to know. reporter: tennessee republican tim burchett rep believes the pentagon is withholding evidence of possible extraterrestrial encounters. i want transparency. just released all the files they have on it. quit with this redacted stuff and let s get it out there. reporter: former intelligence officer david grusch will tell congress tomorrow that he was denied access to information on a secret government ufo crash retrieval program, something the pentagon disputes. astronomers seth shostak said the pentagon would have little incentive to cover up ufo encounters. why would they do that? and almost invariably, the responses, well, the public couldn t handle the news. that s