DD meaning in Military and Defence ?

Answer: What is Duplex Drive mean?

DD or Duplex Drive tanks, nicknamed "Donald Duck tanks", were a type of amphibious swimming tank developed by the British during the Second World War. The phrase is mostly used for the Duplex Drive variant of the M4 Sherman medium tank, that was used by the Western Allies during and after the Normandy Landings in June 1944.

DD tanks worked by erecting a 'flotation screen' around the tank, which enabled it to float, and had two propellers powered by the tank's engine to drive them in the water.

The DD tanks were one of the many specialized assault vehicles, collectively known as Hobart's Funnies, devised to support the planned invasion of Europe.

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Degree Days	Academic & Science
Difference in Differences	Academic & Science
Dual Diagnosis	Academic & Science
Design Development	Academic & Science
Detailed Design	Academic & Science
Demonstration Division	Academic & Science
Direct Debit	Accounts and Finance
Demand Deposit	Accounts and Finance
Demand Draft	Banking
Decisions, Decisions	Business
Double Duty	Business
Delay Discounting	Business
Design and Development	Business
DDS Wireless International Incorporated (de-listed)	Business
Direct Deposit	Business
E. I. DuPont de Nemours & Company	Business
Dialing for Dollars	Community
Down and Dirty	Community
Council Governor's Council on Developmental Disabilities	Community
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Dearly Departed	Community
Disco Direction	Community
Domestic Discipline	Community
Delilah's Den	Community
Denton Daily	Community
Dumb and Dumber	Community
Daily Digest	Community
Doctor Doom	Community
David Duchovny	Community
Donald Duck	Community
Developmental Disability	Community
Doris Day	Community
Duplicate Disk	Computer Assembly Language
Discharged Dead	Computer Hardware
Disk Duplicator	Computer Hardware
Disk Data	Computer Hardware
Double Density (floppy Disk)	Computer Hardware
Data Duplicator	Computer Hardware
Disk Drive	Computer Hardware
Data Definition	Computing
Data Dump	Computing
Disk Dump	Computing
Destroy Disk	Computing
Deterministic Data	Computing
Definition Description	Database Management
Defined Definition	Database Management
Definition Data	Database Management
Doctor of Divinity	Educational Degree
Double Degree	Educational Degree
Dolby Digital	Electronics
Double Diode	Electronics
Compressed Macintosh File Archive (diskdoubler)	File Type
Desert Dreams	General
Dwight David	General
Depersonalization Disorder	General
Due Dilligence	General
Decant Detail	General
Double Death	General
Double Drat	General
Dirty Dirty	General
Description Details	General
Dwight Douglas	General
Designated Drinker	General
Direct Dialed	General
Dawn Danielle	General
Dishy Daddy	General
Dilivered DD	General
Deadly Duo	General
Doordarshan DD	General
Dunkin Donuts	General
Dare Devil	General
Dylan Daniel	General
Darkest Dungeon	General
Daddy's Dog	General
Doubly Delightful	General
Deep Dish	General
Data Description	General
Discuss Disgusts	General
Definition Definition	General
Doctor of Divisionnity	General
Definition Decimal	General
Definition of DD	General
Disk Destroyer	General
David Douglas	General
Double Defense	General
Disney Daughter	General
Daily Dose	General
Dueling Dragons	General
Document Discriminator	General
Dopey Daughter	General
Dynamic Difficulty	General
Distant Dream	General
Digital Delay	General
Darling Daughter	General
Dearest Daughter	General
Double Disc	General
Double Dicking	General
Death Domain	General
Digital Data	General
Distraction Disturber	General
Daniel Defense	General
Doubled-Die	General
Direct Drive	General
Dwarven Defender	General
Double Distinguished	General
Dino Digs	General
Dumb Duck	General
Damn Dirty	General
Dead Dad	General
Draft Dog	General
Destroyer (Destroyer type, Destroyer sub-type)	General
Due Diligence	Governmental
Designated Driver	Governmental
Drug Dealer	Governmental
Division Director	Governmental
Department of Drugs (Swedish Regulatory Agency)	Governmental
Department of Defense Form	Governmental
Drainage Division (N.I.)	Governmental
Doordarshan	Indian Government
DAUND JN	Indian Railway Station
Daman and Diu	Indian Union Territory
Double Density	Information Technology
Delhi Daredevils	IPL Team
Disco Dancer	Jobs
Deputy Director	Jobs
Default Distribution	Maths
Decimal Degrees	Measurement Unit
Dry Dressing	Medical
Distant Disease	Medical
Digital Dentistry	Medical
Developmental Disabilities	Medical
Differential Diagnosis	Medical
Developmental Delay	Medical
Delusional Disorder	Medical
Dead Deer	Medical
Device Deficiency	Medical
Discharge Diagnosis	Medical
Dear Daughter	Messaging
Direct Damage	Military and Defence
Duplex Drive	Military and Defence
Deployment Descriptor	Military and Defence
Department of Defense	Military and Defence
Defensive Damage	Military and Defence
Destroyer	Military and Defence
Data Devices	Military and Defence
Dms Discretion	Military and Defence
Diffractive Dissociation	Physics Related
Differential Detection	Physics Related
Data Dumper	Softwares
Duplicate Data	Softwares
Data Dependent	Softwares
Device Dump	Softwares
Data Depository	Space Science
Data Display	Space Science
Decoder Driver	Space Science
Dedicated Display	Space Science
Directives Documentation	Space Science
Mechanical and Facilities Engineering Directorate, Kennedy Space Center	Space Science
Damage Dealer	Sports
Double-double (basketball)	Sports
Degree of Difficulty	Sports
Double Dark	Sports
Digit Directory	Telecommunication