| APOSI | Air Force Office of Special Investigations |
| APRO | Aerial Phenomena Research Organization |
| ATIC | Air Technical Intelligence Center |
| ASIO | Australian Security & Intelligence Organization |
| BUFORA | British UFO Research Association |
| CUFOS | Center For UFO Studies |
| CIA | Central Intelligence Agency |
| CSS | Central Security Service |
| CAUS | Citizens Against UFO Secrecy |
| DIA | Defence Intelligence Agency |
| DIS | Defence Intelligence Staff |
| DS8 | Defence Secretariat 8 |
| FBI | Federal Bureau Of Investigation |
| FAA | Federal Aviation Agency |
| FOBS | Fractional Orbital Bombardment System |
| IPU | Interplanetary Phenomenon Unit |
| JARIC | Joint Air Reconnaissance Center |
| JIC | Joint Intelligence Committee |
| MOD | Ministry Of Defence |
| NASA | National Aeronautics & Space Administration |
| NICAP | National Investigations Committee On Aerial Phenomena |
| NRO | National Reconnaissance Office |
| NRC | National Research Council |
| NSA | National Security Agency |
| NORAD | North Americian Aerospace Defence Command |
| NATO | North Atlantic Treaty Organizaton |
| PUFORG | Plymouth UFO Research Group |
| QFSRB | Queensland Flying Saucer Research Bureau |
| RAF | Royal Air Force |
| RAAF | Royal Austrailian Air Force |
| RCAF | Royal Canadian Air force |
| RCMP | Royal Canadian Mounted Police |
| SIS | Secret Intelligence Service |
| SAAF | South Africian Air Force |
| SIGAP | Surry Investigation Group On Aerial Phenomena |
| USAF | United States Air Force |
| YUFOS | Yorkshire UFO Society |