Paul, it isn't just the USA, this is being talked about all over the world, other governments have released information these things are off world visitors coming here, you just haven't researched this subject enough to know that yet. Reality is, this hasn't been kept a secret very well. I'm not sure the anal probe story wasn't disinformation or even black ops to make individuals claiming abductions put out strange stories like that making they whole thing seem even more nuts, but I haven't heard of more individuals claiming such for a long time now. If you want to check into some well known videos showing the visitations are real, search YouTube, there are some you can find there showing a ship off shore over the black sea in Istanbul, there is also a giant cylinder ship photographed over an international airport in China which shut down operations there which is public and was reported in the media around the world for a short period of time. Also, there was a ship hovering over a terminal in Chicago which made our own national news too, but other media outlets didn't hype it up much, the story died.
If they did retrieve crashed ships, their first priority would be to reverse engineer them and keep this from the public (and other governments) to keep from causing panic, too much panic and the systems supporting the government could crumble, or worse than that, the threads holding society together, snap. Best to go slow, study, build, suck up as much money as they could to build their own space based and off world operations and then, slowly bring the rest of humanity into knowing about these other races, once their technology dominance over other governments has been achieved. That's how I would do it, why waste an opportunity to get ahead? They could also continue sucking more funds by using that technology to produce some false flag (alien) operations making them appear as a threat, the amount of money to further expand their secret space ops would be incredible. We could go that direction, or maybe decide to slowly open up about the reality, if influenced by others to stop the deception, assuming there are others we respect who have ethics like that.
Paul, we are out of synch because I deleted a shorter version of this post while you were apparently typing your response up, I added it again after you posted, unfortunately.