In August of 1966 UFOs were spotted near minuteman missile launch facilities (3 separate silos) located at or near Carpio and Grano North Dakota, under the administration of the 862nd Combat Support Group (SAC) Minot AF.
Not only were the UFOs spotted by the personnel of the missile silos (e.g., Mike Flight), they were tracked by radar; Additionally, the UFOs, according to witnesses "affected radio transmissions," which became more severe when the UFOs were in closer proximity to the launch facilities (silos). During this incident one of the UFOs was reported to "land."
Immediately measures were taken: AN F-106 Interceptor was launched; additionally, an airborne KC-135 was diverted to scan the area. On the ground a strike team was dispatched to the area of the reported landing.
One of the witnesses, a site activation team member made of a drawing of the object which resembled a "classic flying saucer shape:
By Department of The Air Force
Headquarters 862nd Combat Support Group (SAC)
Minot AFB, North Dakota
8-24-19
Source
The Ufo Chronicles