\x34Historically Yours\x34 by Liz Davis is a blog about American historical trivia--anything American since 1492.
December 17, 1969
Project Blue Book
Project Blue Book was the name given by USAF to record sightings and findings of Unidentified Flying Objects (UFOs) from 1947 until it ceased to exist on December 17, 1969.
Other sources claim it was "just a low level collection and disinformation program created under Project Sign" to cover up the real investigations.