Is "eleven years ago" soon enough for you? The President John F. Kennedy Assassination Records Collection Act of 1992 (Public Law 102-526) ordered the review and release of pretty much all such records.
For example, if you want to see the 113 records released by the NSA under this act, see NSA JFK documents.
Summaries of the material can be found at the National Archives JFK Assassination Records webpage. The released material consists of more than 4.5 million pages of assassination-related records, photographs, motion pictures, sound recordings and artifacts.
The movie "JFK" by Oliver Stone was a giant load of conspiracy-theory propaganda, but it did serve on useful purpose: The public interest in the JFK assassination it raised, and the stink it made about the remaining unreleased records, lit a fire under Congress and they moved to release the records in 1992.
If you're wondering why you haven't heard of this, it's because the conspiracy theorists seldom talk about it, since the truckload of newly released material *still* fails to support their conspiracy fantasies.
As one satirical "newspaper" wrote in their classic "headline" for November 22, 1963, ridiculing the proliferation of wildly varying conspiracy theories, "KENNEDY SLAIN BY CIA, MAFIA, CASTRO, LBJ, TEAMSTERS, FREEMASONS: President Shot 129 Times From 43 Different Angles".
So what Amazing Revelations were revealed in these documents that the Grand Government Conspiracy had been "hiding" all these years? Nothing, really, which was a great disappointment for those who believed that the Real Story was somehow being concealed in them.
No reasonable person, after reviewing the evidence presented by those who attempt to explain what happened, can come to the conclusions they did. Forensics don't lie.