In 1969 the US Air Force issued a statement that read‚ "No UFO reported, investigated, and evaluated by the Air Force was ever an indication of threat to our national security." This statement has been proven untrue by the testimony of many military officers and airmen and documentation of incidents involving UFOs and nuclear weapons, testimonies of which the US Air Force was fully aware. UAPs and the Nuclear Puzzle details many of these testimonies, some for the first time.

From the outset, Hynek and Vallee make their position clear: UFOs represent an unknown but real phenomenon. The far-reaching implications take us to the edge of what we consider the known and real in our physical environment. Perhaps UFOs signal the existence of a domain of nature as yet totally unexplored. These two eminent scientists studied the UFO phenomenon for decades and collaborated on this landmark report.

Them is the first book ever to examine the intent of the presence known as "aliens" or "visitors" from the perspective of what both civilian and military close encounter witnesses report happening to them.

What is the nature of unidentified aerial phenomena? Forty years ago a small cadre of dedicated researchers began actively investigating cases, interviewing witnesses, and exchanging data through a small, informal network of international contacts. Today this low-profile network, or "invisible college", has grown into a larger, multination volunteer research effort joined by many individuals. But the questions first raised 40 years ago remain current - and unanswered. 

This classic in the field of ufology is filled with hard-hitting eyewitness testimony of one of the most important events of all time: the actual recovery of a UFO outside of Roswell, New Mexico, in 1947. For more than seventy years, government authorities have led us to believe the wreckage was merely a very conventional weather balloon - but the witnesses who were there continue to tell a different story. Witness to Roswell once again provides a "can't put down" written account of what really transpired in Roswell decades ago.