What does DDAY stand for?

Commencement of Hostilities Day or Contingency Operations (usually written as D-Day)

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Division DSU Automated Supply System DoD (Department of Defense) DSCA (Defense Support to Civil Authorities) Automated Support System De Dolfijnen Asse Ternat (Dutch: The Dolphin Asse-Ternat; swim club; Asse and Ternat, Belgium) Dyslexia, Dyspraxia and Attention Treatment (UK) Deputy Directorate for Antiterrorism/Force Protection Data Display Audio Visual (Houston, TX) 1-Desamino-8d-Arginine Vasopressin Deamino-Delta-D-Arginine Vasopressin (hematology) Desmopressin Acetate (synthetic analogue of the pituitary hormone 8-arginine vasopressin) Developmental Disabilities Alliance of Western New York		De Delftse Bedrijvendagen (Delft University of Technology career fair) Deaf, Dumb and Blind Deep-Discount Bond Den Danske Bank (Denmark) Dependency Directed Backtracking (tree search algorithms) Deutsche Digitale Bibliothek (German: German Digital Library) Device Dependent Bitmap Digital Data Buffer Digital Data Bus Digital Database