One of the sticking points for Roswell skeptics is the idea that "witnesses" and participants would not be or would not have been able to keep the secret of what happened near Roswell in 1947 for as long as they had or have.
But here is a cautionary news item that indicates secrets are sometimes kept for decades, sometimes forever:
Click HERE for a Cold War Secret
And note this aside in the middle of the news account:
So too is the human tale of the 45-year-old secret that many took to their graves.