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The military deleted a passage about unidentified flying objects from a 2008 Air Force personnel manual just days after The Huffington Post asked Pentagon officials about the purpose of the UFO section. Before the recent revisions, the document -- Air Force Instruction 10-206 -- advised pilots, radar operators and other Air Force personnel on what to do when they encountered any unknown airborne objects. Now in the 2011 version, the reference to UFOs -- which simply means "unidentified flying objects," not necessarily spaceships with little green men -- has been eliminated. What makes this so intriguing is that the U.S. government officially stopped investigating UFOs in 1969 with the termination of the Air Force's Project Blue Book.