168.5500 has a national authorization for smokejumpers and helicopter rappel crews only. The jumpers use a 123.0 input/output tone and the helicopters use a 110.9 tone. I wonder if jumpers were used to speed up the response due to remoteness. Smokejumpers have temporary bases in New Mexico this time of year or they can come down from Boise.
The BLM Southern Nevada District provides wildland fire protection for most of the test site, except in the old nuclear testing portion. I don't know who or what "Dreamland" is. Air tankers identify with a nationally assigned number such as "Tanker 101," "Tanker 56" and not with their FAA registration or tail number. There isn't an aviation unit that identifies with the term "spotter," they will identify with "air attack" or "lead." Leads only have a pilot, but when a air supervision person is added they identify with "Bravo." It is called an "Air Supervision Module" and can supervise aircraft if there is more than one air tanker or helicopter on scene, without having an "Air Attack" or Air Tactical Group Supervisor on scene.
Thanks for the camera link, I will use it in the next few days.