In "burned" documents and recently declassified information conspiracy theorists have noticed a VERY interesting line.

The code name at the time for the president was "Lancer" which is why the statement - ‘As you must know, Lancer has made some inquiries regarding our activities, which we cannot allow" makes people curious. Even more interesting than that lone statement is that it was written by the CIA director at the time. 

The documents are available for viewing in the images below but a full translation is as follows for those who can't make out the text:

MEMORANDUM FOR:
The Director (blacked out classified), CIA

SUBJECT: Classification of all UFO intelligence files affecting National Security.

As I had discussed with you previously, I have initiated (blacked out classified) and have instructed James Webb to develop a program with the Soviet Union in joint space and lunar exploration. It would be very helpful if you would have the high threat cases reviewed with the purpose of identification of bona fide as opposed to classified CIA and USAF sources. It is important that we make a clear distinction (unintelligible word here) the knowns and unknowns in the event the Soviets try to mistake our extended cooperation as a cover for intelligence gathering of their defense and space programs.

When this data has been sorted out, I would like you to arrange a program of data sharing with NASA where Unknowns are a factor. This will help NASA mission directors in their defensive responsibilities.

I would like an interim report on the data review no later than FEB 1, 1964.

Signed: John F. Kennedy