IMHO that image has been doctored. The last line of the first paragraph where it says something to the effect that "disclosure is coming" is darker
than the rest of the text. Furthermore when zoomed in you can compare the lettering and it is not even close to the rest of the document. This is a
terrible attempt at a hoax and if you created this document you are pathetic. I was going to say "nice try" but it was not.
who is the letter addressed to? Major Donald Kehoe. Now I might be wrong about this but doesn't this guy have a less than reputable reputation?
and notice the date 1960