Project 10073 Record Card - Sighting Report, 4 March 1958, Dugway, Utah

This document is a Project 10073 record card and associated correspondence regarding a UFO sighting reported on 4 March 1958 at Dugway, Utah. The witness, Elva A. Greenhalgh, a management analyst for the U.S. Civil Service at the Dugway Proving Grounds, reported observing between 20 and 40 objects at approximately 1200Z. The objects were described as long, tapered on both ends, white in color, and possessing a steady glow. The witness noted that the objects appeared to be in an echelon formation, were roughly the width of the moon, and moved horizontally at an elevation of 30 degrees before fading into the west. The observation lasted for 12 minutes. The report includes detailed weather data for the area, noting clear skies with no visible clouds and extremely bright moonlight. The official conclusion reached by the Air Technical Intelligence Center and the 2849th Air Base Wing was that the sighting was a case of mistaken identity involving natural phenomena, specifically lenticular clouds. The report notes that while the weather group did not initially report M7 clouds, the description provided by the witness matched the characteristics of thin, semi-transparent altocumulus patches, often referred to as lenticular clouds, which can appear in layers and maintain their shape. Captain Albert W. Scott of the Security Division signed off on the report, concurring with the assessment that the glow of the objects was attributed to the brightness of the moon.