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Behind every successful military operation lies a web of secret code names that reveal the intricate planning of history's most ambitious invasion. From "Operation Overlord" to dummy paratroopers called "Ruperts," discover the fascinating terminology that orchestrated D-Day's triumph and kept Allied strategies hidden from enemy eyes.
Operation Overlord: The overall code name for the Allied invasion of Northwest Europe.
Operation Neptune: The naval phase of D-Day, covering the amphibious invasion and establishment of a secure foothold.
Operation Bodyguard: The overall Allied deception strategy designed to mislead German High Command about the timing and location of the invasion.
Operation Fortitude: A major deception operation, part of Bodyguard, divided into two parts:
Fortitude North: Created a fictional threat of invasion in Norway
Fortitude South: Convinced Germans that the main invasion would target Pas-de-Calais rather than Normandy
Operation Pointblank: The strategic bombing campaign targeting German aircraft production, fuel supplies, and airfields to gain air superiority.
The five landing beaches were assigned the following code names (from west to east):
Utah: American landing beach (westernmost)
Omaha: American landing beach
Gold: British landing beach
Juno: Canadian landing beach
Sword: British landing beach (easternmost)
Albany: Operation for dropping the 101st Airborne Division
Boston: Operation for dropping the 82nd Airborne Division
Tonga: British 6th Airborne Division's landing on the eastern flank
Chicago: 101st Airborne Division glider operation
Detroit: 82nd Airborne Division glider operation
Elmira: 101st Airborne follow-up glider reinforcements
Keokuk: 82nd Airborne follow-up glider reinforcements
Operation Titanic: Dropping dummy paratroopers (called "Ruperts") to simulate airborne invasions and draw German forces away from actual drop zones
Operation Taxable: RAF planes dropping "Window" (metal foil strips) to create false radar readings of a naval convoy near Le Havre
Operation Glimmer: Similar to Taxable but conducted near Boulogne-sur-Mer
Operation Quicksilver: Creating the fictional First US Army Group (FUSAG) in southeastern England to convince Germans of an invasion at Pas de Calais
Operation Copperhead: Using an actor (M.E. Clifton James) who resembled General Montgomery to travel to Mediterranean areas before D-Day to mislead Germans
Rebecca-Eureka: Navigation system where aircraft carried "Rebecca" receivers to home in on "Eureka" beacons deployed by pathfinder teams
BUPS (Beach or Battery Unit Position System): Homing beacons for paratroopers
Gee: Navigational system for aircraft
SCR-717: Navigational radar used on lead pathfinder aircraft
Window: Codename for the metal foil strips dropped to confuse German radar
Hobart's Funnies: Collection of specialized armored vehicles developed for the invasion, including:
AVRE (Armoured Vehicle Royal Engineers)
Churchill Crocodile: Flamethrowing tanks
Sherman Crab: Mine-clearing tanks with flails
BARV (Beach Armoured Recovery Vehicle)
ARC (Armoured Ramp Carrier)
Mulberry Harbours: Pre-fabricated portable harbors towed across the Channel
Gooseberries: Breakwaters formed from sunken ships as part of Mulberry harbors
PLUTO (Pipe-Line Under The Ocean): Underwater pipeline for fuel supply
SHAEF (Supreme Headquarters Allied Expeditionary Force): Overall command headed by General Eisenhower
FUSAG (First United States Army Group): A fictional army group created as part of the deception plan
COSSAC (Chief of Staff to the Supreme Allied Commander): Early planning organization
BIGOT: A security classification for the most secret D-Day plans (likely derived from "To Gibraltar" written backward)
Double-Cross System: The system of turned German agents providing false information back to Germany
100 Minor Code Names and Military Terms
Bolero: Build-up of American forces in Britain before D-Day
Bombardon: Floating breakwaters used in Mulberry harbors
Bullbasket: Special operations to disrupt German communications in France
BUPS (Beach Unit Position System): Homing device for assembly points
Camelot: Radio call sign for 101st Airborne headquarters
Chaff: Radar-confusing metal strips (also called Window)
Cobra: Breakout operation from Normandy by US forces (July 1944)
Cockade: Earlier deception plan that influenced Operation Bodyguard
Comet: Early version of Market Garden operation
Cooney: Call sign for one of the Sword Beach sectors
Corncob: Code for ships to be sunk to create breakwaters
COSSAC: Chief of Staff to the Supreme Allied Commander
Coxen: Radio call sign for command posts
Deadstick: Operation to capture Pegasus Bridge by glider forces
Dime: One of the code-named areas at Omaha Beach
Dog Green: One of the sectors on Omaha Beach
Dog White: Another Omaha Beach sector
Dove: Underwater obstacle removal unit (part of demolition teams)
Duck: Amphibious truck (DUKW)
Eagle: US 101st Airborne Division symbol
Easy Fox: Patrol boat call sign
Easy Red: Omaha Beach sector
Elephant: Pre-fabricated concrete harbor sections
Epsom: British offensive after D-Day near Caen
Flash: Allied recognition signal
Flashlamp: Signal lights used by pathfinders
Fox Green: Omaha Beach sector
Fox Red: Easternmost sector of Omaha Beach
Funnies: Special purpose armored vehicles created by Hobart
Gauntlet: Special operations in Normandy
George: Code name for Gold Beach assembly area
Gooseberry: Code for the initial breakwaters for Mulberry harbors
Goodwood: British armored offensive in July 1944
Grasshopper: Light aircraft used for artillery spotting
Greenland: 1st Battalion, 16th Regiment, 1st Division landing zone
Hacksaw: Explosive used in clearing obstacles
Hail Mary: Radio code signal
Hambone: Part of airborne operations plan
Hands Up: Code name for a German prisoner of war camp
Hawser: Naval mine clearance operation
Hedgehog: Beach obstacle of angled steel rails
Hellcat: US tank destroyer
Hillman: German fortress near Sword Beach
Hoboken: Training exercise for amphibious operations
Holophane: Marking lights used by pathfinders
Hornpipe: Naval gunfire support vessel
How: Sector on Utah Beach
Husky: 1943 Sicily invasion (precursor to Overlord)
Imperator: German defensive position
Ironside: Deception operation suggesting landings near Bordeaux
Jasper: Code name for Canadian forces
Jellyfish: Original code name for what became Juno Beach
Jericho: Bombing operation against prison walls to allow escapes
Jig: One of the British beach sectors
Joe: Naval bombardment observer
King: Sector on Gold Beach
Kittyhawk: Allied fighter aircraft
Liberty Road: The route taken by Allied forces through France
Lion: British sector landing code
Love: Sector on Utah Beach
Mallard: Follow-up glider operations on D-Day evening
Mercury: Communications network code
Michigan: Assembly area in England
Mike: Naval sector designation
Monty's Moonlight: Artificial illumination used during night operations
Morris: Code name for Sword Beach sector
Nebraska: US area designation in England
Nellie: Special mine-clearing device
Oyster: Naval command ship
Peter: Code name for Sword Beach sector
Phoenix: Concrete caissons for Mulberry harbors
Pirate: Assault team code name
Plum: Security classification level
Queen: One of several beach sectors
Queen Red: Sector of Sword Beach
Rabbit: Small landing craft
Ramrod: Fighter escort mission
Redoubt: German defensive position
Roger: Easternmost planned landing sector (not used)
Roustabout: Construction unit for Mulberry harbors
Rupert: Nickname for paradummy (dummy paratrooper)
Sausage: Floating roadway component of Mulberry harbors
Scarecrow: Deception element
Screwball: Obstacle clearance team
Sledgehammer: Earlier planned cross-channel attack
Soxo: Naval support vessel code
Spud: Landing craft control vessel
Sugar: Sector on Utah Beach
Sunflower: Communications code
Tiger: Pre-invasion training exercise (which ended disastrously)
Tombola: Radar countermeasure
Trident: 1943 Washington conference that approved Overlord concept
Uncle: Beach sector designation
Viper: Demolition team
Whale: Floating pier elements of Mulberry harbors
Weasel: Tracked supply carrier
Wednesday: Original date proposed for D-Day (later changed to Tuesday)
X-Ray: Early code name for what would become Utah Beach
Yoke: Early code name for what became Omaha Beach
