I've been researching the Minot October 1968 UFO incident and came across information that appears to clarify Col. Arneson's statements concerning his receipt of a message relating to "UFO(s) sighted around missile silos." My blog post, "The Oscar Flight Mystery: Dwynne Arneson" covers his affidavit that was presented back in 2010.
It is readily apparent that all UFO sightings/reports were sent to the affected region's ADC Air Division regardless of the command making the report. Since Minot AFB, ND was in the 28th Air Division's jurisdiction all of it's UFO reports were sent to Malmstrom (28th's location).
With this in mind, Col Arneson's recollection of a message listing a UFO(s) sighting would have been consistent with the protocols in place during his tenure at Malmstrom. Based on Arneson's responsibilities within the air division, he would have had access to these types of message traffic.
The Minot message sent to Malmstrom (October time frame of 1968) was "Unclassified."
I'll post a copy of the Minot message with a future blog post on that specific incident once the article is completed.