http://www.nicap.org/articles/520729ennis_article.pdf

Subject: July 29, 1952; Montana Air Base Reports Flying Discs 

Montana Air Base Reports Flying Discs
GREAT FALLS. Montana
­Flying saucers which hovered over the Great Falls area and then took off at "a tremendous rate of speed," were reported Tuesday by a sergeant at the Great Falls Air Force Base.

Sgt. Charles Boden said he was listening to a direct communications system with McChord Air Force Base in Washington and learned that saucers were sighted over that Air Force Base "heading toward Great Falls." Boden said he immediately began scanning the skies, about 2:30 p.m. M.S.T.

Objects Sighted
About four and a half minutes after hearing the McChord report, he said he sighted the objects. He reported that two of the saucers appeared stationary at first, then another came "whipping going West" and the two stationary objects then appeared to take off, following the third.

(A McChord spokesman said tuesday night there were several flaws in Boden's story. He denied there had been any conversation between McChord and Great Falls bases about 2:30 p.m. concerning flying saucers"over McChord. And also pointed out that saucers would not be "going west," as Boden reported, if they were traveling from McChord, in Washington, state, to Great Falls.)

Contradiction?
("I can say categorically we logged no unusual sightings over McChord this afternoon," the spokesman declared. "Two unusual objects at high altitude and (Continued on Page 15, Col. 6)
traveling at great speed were sighted in the morning, but a check showed definitely they were jets from our own base.")

Later in the afternoon Boden said he sighted four traveling in the opposite direction. He described the objects as circular in shape and not thick and added they gave off no sound or left no vapor trails.

If the saucers over McChord and the ones Boden reported were the same, a rough estimate of the speed would be 3,360 miles an hour.
Other persons in Great Falls also said they saw saucers.