Abbreviations
| BdU | Befehlshaber der Uboote or Commanding Officer Submarines |
| BETASOM | Italian Submarine Flotilla and Naval Base at Bordeaux |
| C. in C. | Commander in Chief |
| CREM | Corpo Reale Equipaggio di Marina (Military personnel in Regia Marina) |
| FAA | Fleet Air Arm |
| GRUPSOM | Gruppo Sommergibili or Submarine Flotilla |
| HMS | His Majesty’s Ship |
| HMAS | His Majesty’s Australian Ship |
| HMCS | His Majesty’s Canadian Ship |
| HMIS | His Majesty’s Indian Ship |
| HNMS | Her Netherlands Majesty’s Ship |
| HHMS | His Hellenic Majesty’s Ship |
| HMNZS | His Majesty’s New Zealand Ship |
| HMSAS | His Majesty’s South African Ship |
| ISLD | Inter-Services liaison detachments (MI6 in the Middle East) |
| MARICOSOM | Italian Submarine Command |
| MARIGAMMASOM | Italian Submarine Training Base at Gotenhafen |
| MARISUPAO | Comando Superiore Marina in Africa Orientale or the Italian Naval High Command in East Africa |
| MI6 | British Intelligence Service (aka SIS or Secret Intelligence Service) |
| OKM | Oberkommando der Kriegsmarine or German Naval High Command |
| OSS | Office of Strategic Services |
| RAAF | Royal Australian Air Force |
| RAF | Royal Air Force |
| RHAF | Royal Hellenic Air Force |
| RHN | Royal Hellenic Navy |
| RM | Royal Marine |
| RN | Royal Navy |
| RNVR | Royal Navy Volunteer Reserve |
| SKL | Seekriegsleitung or German Maritime Warfare Command |
| SIM | Servizio Informazioni Militare, the Italian Intelligence Secret Service |
| SLC | Siluri a lenta corsa or Human Torpedoes (“Chariots”) |
| SOE | Special Operations Executive |
| STAMAGE | Stato Maggiore Generale aka Comando Supremo or Italian High Command |
| USN | United States Navy |
| USS | United States Ship |
| USAAF | United States Army Air Force |