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The first named Air Force investigation of the UFO phenomenon was Project Sign. Of the original nine rolls of Project Sign microfilm, four were given to Dr. Herbert Strentz in 1968 by Lt. Col. Hector Quintanilla to use in the preparation of his Ph.D. dissertation. Two additional microfilms from the Project Sign collection were preserved by Dr. J. Allen Hynek. There are no known extant copies of the remaining three Project Sign microfilm rolls. Many of the reports contained in the Project Sign microfilm collection are duplicated in the Project Blue Book microfilm collection but the quality of the Project Sign versions of these documents is often superior.
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