For decades, retired U.S. Army Sergeant Clifford Stone remained one of the most controversial figures in UFO research. Stone claimed that during his military career he participated in highly classified recovery missions involving unidentified flying objects and non-human beings.
According to his testimony, military personnel had access to a confidential field manual containing descriptions of 57 different extraterrestrial species. He alleged that the handbook was intended for specialized recovery and medical teams, providing information about the biological characteristics and handling procedures for various non-human entities.
Stone also claimed that some crash retrieval operations involved living beings rather than just wreckage. One of his most extraordinary stories described a reptilian-like entity known as “Corona,” which he said maintained a long-term telepathic connection with him.
Despite the remarkable nature of these claims, no official evidence has ever been released to verify the existence of such a manual. Neither the U.S. government nor the Department of Defense has confirmed Stone’s allegations, leaving the story within the realm of UFO testimony and speculation rather than established fact.
Today, the alleged “57 Alien Species Manual” remains one of the most debated stories in the UFO community, inspiring both believers and skeptics while raising questions about what governments may—or may not—know about the possibility of extraterrestrial life.