Try Homeland Security Exercise and Evaluation Program HSEEP website. Most the training information and exercise templates are open source.
HSEEP Mission Overview Briefing
The Homeland Security Exercise and Evaluation Program is a capabilities and performance-based exercise program that provides a standardized policy, methodology, and language for designing, developing, conducting, and evaluating all exercises.
https://hseep.dhs.gov/pages/HSEEP_Home.aspx
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