The 1968 Minot UFO Incident
UFO Casebook (from whom the rendering above comes) has noted the sighting also and an earlier one too::
Robert Hastings, too, has found these UFO cases to have high interest because the episodes involve an airbase that housed nuclear missiles, which seem to have been compromised by the appearance of the UFOs.
Picture from Earthfiles.com:
That is, the UFOs were, like their often seen/reported counterparts, AI machines looking to communicate with what they, the machines, thought were AI machines -- the nuclear facility and its missiles -- tethered to the ground.
This case is one that shows us several things, the absurd explanation of it by Blue Book and the impeccable veracity of the military witnesses, with radar confirmations and visual sightings.
That the UFOs did no intrinsic harm to the missiles themselves, or the facility (and its staffed participants) tells me that it was a machine-inspired probe to determine if the technology at Minot was AI oriented, or a like-form [sic] of machine intelligence that UFOs seem to be looking for. (See previous postings here on this.)
Maybe Tim will elaborate on the sighting for me/us. They, the Minot cases, may be a Zoam Chomsky quagmire.