Dang, there was a post by
@MdWIldcat55 that's now been deleted to which I was going to respond.
@Caveman Catfan quoted it above, though.
"I've been around Washington a long time. And one thing I can tell you: The bureaucracy and the military are terrible at keeping secrets."
I've lived and worked in DC for 25+ years, so respectfully, you probably don't have any particular type of insight that I don't.
On the surface, your argument sounds good, but misses the mark. For instance, if Roswell happened, the gov't certainly *was not* able to keep a secret. The same with Rendlesham Forest, Cape Girardeau, MO, etc. There's been a drips and drops of information over the decades. There was also an active disinfo campaign to marginalize those who tried to come forward, as well as disinfo campaigns disguised as investigatory programs (Project Grudge and Project Blue Book) to dismiss the topic. It's telling that Dr. J Allen Hynek, who was involved with Project Blue Book, ultimately came around to the conclusion research into UAPs shouldn't be stymied/ridiculed:
"In April 1953, Hynek wrote a report for the Journal of the Optical Society of America titled "Unusual Aerial Phenomena," which contained one of his best-known statements:
In 1953, Hynek was an associate member of the Robertson Panel, which concluded that there was nothing anomalous about UFOs, and that a public relations campaign should be undertaken to debunk the subject and reduce public interest. Hynek would later lament that the Robertson Panel had helped make UFOs a disreputable field of study."
Again, for many years, there was a huge amount of stigma for serious research into the UAP topic, and anyone who came forward was ridiculed in the mainstream.
Continuing on...
"Is it really possible all that could have gone on for roughly 80 years, and not one tangible piece of information -- one reverse-engineering schematic, one memo up the food chain, one autopsy report on a non-human being, one fragment of a craft that could be demonstrated to be on non-earthly origins, has ever surfaced? Even when doing so would make the person leaking the stuff — not second or third hand rumors like Grusch but real, provable evidence —a hero who literally changed the way we view our place in the universe?"
The U.S. government can keep a secret if it wants to, and it can do so in several different ways: over-classification, compartmentalization, administrative reprisals or the threat thereof, to name a few. Sometimes, the government can keep a secret so well, it forgets it own secret. The most secretive agency in the U.S. gov't isn't the Pentagon, it's probably the Dep't of Energy. So, if you wanna keep something secret, don't let the Pentagon keep it, transfer it to the national labs like Los Alamos, keep it secret under the DOE's own classification system, and then at some point have it transferred into a contractor's system. That way the Pentagon mostly has plausible deniability.
Anyway, as an example of keeping something secret to the point the gov't forgets about it, I point you to the material known as "Fogbank," which is an aerogel used in our nuclear weapons. It was so secret that in the late 1990s, when the gov't decided it needed to refurbish some of its nukes, it realized it had forgotten how to make the stuff, and didn't re-figure it out until the mid-2000s.
https://en.wikipedia.org/wiki/Fogbank