Apparently, someone involved has lived too long. Just once I would love to see some honesty, just for the novelty of it.
This response to your request was dragged on as long as possible but was, unfortunately, not long enough.
Despite all our best efforts, some of the people involved in the aforementioned request are simply not dead yet. Previously released SIGINT documents all involved dead people.
The classified documents will continue to remain so until anyone who could possibly be implicated is wearing a toe tag.
Also, for fun a pic from the NSA beauty pageant
July 16, 2014
continues to withhold all portions of two documents about the 1961 death of Secretary-General of the United Nations Dag Hammarskjold in Ndola, Northern Rhodesia – now Zambia. The Agency continues to withhold this historically significant material despite a FOIA appeal from the National Security Archive that provides specific examples of previously released SIGINT (Signals Intelligence) documents from the 1950s and 1960s and explains why the Agency should not treat fifty-year-old documents as though they were created today. The Agency’s response to the Archive’s appeal merely reiterated the same exemptions and statutes listed in its original August 2013 denial letter. Its response makes no reference to the evidence provided to the Agency. The Agency also refused to consider the wide public interest in the United States, the international community, and the United Nations for information about Secretary-General Dag Hammarskjold’s mysterious and tragic death while flying to Ndola to resolve a conflict in the Congo. The Agency has refused to help clarify the historical record. The rest hereThe National Security Agency