This is a document by the Rand Corporation, a think tank associated with the USAir Force and the CIA. Rand Corp originally claimed their UFO documents are secret and cannot be publicly divulgated, then later upon FOIA requests, that they not to have any documents related to the UFO phenomenon. The author of the following memo, George Koch, goes to promote the "ET Hypothesis." This is probably the reason that Rand could not have made it public at the time: CIA was involved in efforts to ridicule and discourage any UFO investigation effort. Koch refers to NICAP, the civilian UFO investigation group, several times. This organization had a large number of former CIA personnel in its management and strongly opposed to UFO secrecy.