Examination of this large body of publicly available information immediately provided clues that the witness may have recalled incidents from a period other than July 1947. The first clue was that he repeatedly, in all of the interviews, referred to the injured military person he allegedly transported to the Roswell AAF hospital as an airman. The rank of airman was not in existence in 1947. It was implemented on April 1, 1952.[72] Prior to that date an airman in the Air Force was referred to by the U.S. Army equivalent, a private. Another possible indication that he recalled events from a different time was the description of an alleged “black sergeant” that accompanied the redheaded officer at the hospital. The pairing of a white officer with a black NCO seemed unlikely since in 1947 the U.S. Army Air Forces was racially segregated, as were all branches of the armed forces. The U.S. Air Force did not begin racial integration until the May 11, 1949 issuance of Air Force Letter 35-3 that formally ended segregation.[73] Though it was not impossible in 1947 for a black NCO to accompany and seem to be working with a white officer, it would be unlikely. These two discrepancies did not provide a firm time frame of actual events, if any occurred at all. To approximate a time frame for actual events, the specific details of the information provided were examined. This examination was to determine if any military members were identified by name or by a combination of any other distinguishing characteristics such as rank, position, age, or physical attributes. If the testimony identified a military member as having been present for an event, then their personnel record could be used to affix an approximate date. Affixing a date of an event by referencing personnel records was possible since each military member’s personnel file contains a physical description and chronological listing of duty stations, units of assignment, and work assignments for his/her entire military career. This detailed examination revealed several likely references to specific individuals, which through their personnel files, were documented as having been assigned to the hospital at Roswell AAF or Walker AFB (Roswell AAF was renamed Walker AFB in January 1948). =The “Big Redheaded Colonel.”= An indication that Dennis might have mistaken the date of actual events was that he was quoted in at least one book as having said that the officer who threatened him in the hospital was a big redheaded colonel.[74] Research revealed that only one tall colonel with red hair was known to have been assigned to the Walker AFB hospital. Colonel Lee F. Ferrell was the hospital commander from October 1954 until June 1960.[75] Ferrell was 6′1″ tall and had red hair.[76]