Next Generation First Responder -- Harris County Operational Experimentation (Playbook) [open pdf - 9MB]
From the Administrative and Handling Instructions: "This document provides players, actors, observers, data collectors and controllers from participating organizations the information necessary to observe or participate in the OpEx [Operational Experimentation]. The information in this document is current as of the date of the OpEx, December 4, 2018. All preparation and documentation for the NGFR [Next Generation First Responder] - Harris County OpEx is unclassified."
U.S. Department of Homeland Security: https://www.dhs.gov/