Operation Dark Winter

2001 U.S. bio-terrorist attack simulation exercise

Operation Dark Winter was the code name for a senior-level bio-terrorist attack simulation conducted on June 22–23, 2001. It was designed to carry out a mock version of a covert and widespread smallpox attack on the United States. Tara O'Toole and Tom Inglesby of the Johns Hopkins Center for Civilian Biodefense Strategies (CCBS) / Center for Strategic and International Studies (CSIS), and Randy Larsen and Mark DeMier of Analytic Services were the principal designers, authors, and controllers of the Dark Winter project.

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