The BM festival uses the largest rental radio system in the USA. I started the new radio system in 1998 and it continues to this day after my retirement. Under the current vendor the radio system uses the most advanced state-of-the-art Trbo radio system to provide public safety, fire, ambulance, public works and other services to the temporary city of 80k+ people and an airport with two parallel runways. BLM and local LE share a common dispatch center for coordination. Almost ALL comms are encrypted during the event with AES256 for PS and enhanced Trbo encryption for all other comms. If AES were available for Trbo in the USA like it is anywhere else on the globe, they would be using it.