I doubt the US govt is doing any such thing. There is no advantage for them in doing so even if extraterrestrial intelligence does exist. Space is too vast to allow for visitation or effective communication between planets never mind solar systems.
https://www.reuters.com/world/us/senators-move-require-relea...
I mean, the recent Ezra Klein podcast with the journalist that is "researching" these phenomena and oral accounts is quite telling of the state of things.