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When terrorists crashed a plane into the Pentagon on Sept. 11, 2001, it wasn’t a branch of the military that oversaw the massive emergency response operation—the lead agency was the 266-person Arlington County Fire Department in Virginia.

The emergency response at the Pentagon that day was largely considered a success, by the 9/11 Commission, due in part to the high level of regional cooperation among local, state and federal agencies that enabled first responders to quickly stand up an incident command system.

Twenty years later, emergency preparedness experts say the incorporation of regional training and communications into emergency planning is one of the most important takeaways for local governments from the deadly terrorist attacks…