UFO Magazine Article:

“For years the Air Force has dismissed them as hoaxes, hallucinations or misidentifications. Now the Air Force’s own scientific consultant on unidentified flying objects declares that many of the sightings cannot be so easily explained.” by Dr. J. Allen Hynek, 17 December 1966

(The Saturday Evening Post (magazine), 
Indianapolis, Indiana)

The article was presented by The UFO Chronicles on 26 September 2012:

http://www.theufochronicles.com/2012/09/j-allen-hynek-reports-on-ufo-landing.html

Dr. J. Allen Hynek reports on a UFO landing that occurred near a nuclear missile site in North Dakota on 25 August 1966. According to Hynek, a U.S. Air Force “Strike Team” was ordered to intercept the unknown object.

2 UFOs were sighted by U.S. Air Force guards and confirmed by radar.

Dr. J. Allen Hynek, Astronomer, 
the U.S. Air Force's Scientific Consultant 
on UFOs (1948-1969), 
UFO Author, Lecturer & Researcher 
(4.bp.blogspot.com photo)