In September 1968, Hynek received a letter from Colonel Raymond Sleeper of the Foreign Technology Division. Sleeper noted that Hynek had publicly accused Blue Book of shoddy science, and further asked Hynek to offer advice on how Blue Book could improve its scientific methods. Hynek was to later declare that Sleeper's letter was "the first time in my 20 year association with the air force as scientific consultant that I had been officially asked for criticism and advice ... the UFO problem."