National Guard units from Colorado, New Mexico and Utah will train in the Denver area over the next six days on how to respond to a terrorist attack.
The Colorado National Guard says the exercise will start Thursday and run through Tuesday.
Officials say some of the training will occur at Denver International Airport, Community College of Aurora, Castlewood Canyon State Park, University Hospital and Skyridge Hospital.
Officials say the training scenario calls for mock attacks similar to the ones in Paris in November 2015.
