Lasting physiological effects were reported. Telepathic phenomena were said to have occurred. One disc was observed by one male witness in rocky terrain for two hours (Irwin).

Gerry Irwin, a Nike missile technician, was driving from Nampa Idaho to his barracks at Fort Bliss, El Paso. He'd reached Cedar City when he observed a glowing object crossing the sky. Irwin decided it may have been an airliner on fire, which was attempting to land, and he went to investigate. Using shoe polish, he wrote "Stop" on the side of his car, and left a note on the steering wheel which read: "Have gone to investigate possible plane crash. Please call law enforcement officers"). A short while later, a fish and game inspector did stop and took the note to the Cedar County sheriff, Otto Pfief, who returned to the site with a group of volunteers. No trace of an airplane crash was found, but Irwin was soon discovered unconscious and taken to a hospital. When Irwin finally woke up form a deep sleep, he was puzzled by the absence of his jacket. He was flown back to Fort Bliss and placed under observation for four days, after which he returned to duty. Irwin behaved very strangely; he was plagued by fainting, didn't seem to be aware of the correct date, and kept asking, "were there any survivors?" He was placed in a hospital for psychiatric examination, and the day after being discharged, April 18, Irwin felt a powerful urge to return to the site of his strange encounter. Once there he walked straight to a bush and found his missing jacket. There was a pencil in a buttonhole with a piece of paper wound tightly around it. Irwin curiously took the paper and burned it. He then went to the sheriff Pfief, who provided him with all the details of the initial incident. Shortly thereafter, Irwin's case came to the attention of the inspector general, who ordered a new investigation. On July 10, Irwin re-entered the hospital. On August 1, he failed to report for duty. One month later, he was listed as a deserter and was never seen again.

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