The US government has had ongoing contact with multiple extraterrestrial races since the '50s. Bill Cooper even goes further in his book saying both CIA and NSA were formed as a response to this new reality they faced. Furthermore, he states another interesting fact.
Originally the contact was classified as SECRET, but since the downed ship of that particular unfortunate race had mangled cows in its cargo hold the classification was made TOP SECRET. The cause of widespread cattle abductions and mutilations had been found.
If only they didn't have a burning desire to plow the anus of EVERY. SINGLE. BOVINE. in the US and abroad, we'd have Q crumb 2222 written like pic related.
We have not been as fortunate.