A couple days ago there was some type of training exercise on 258.650. Callsigns heard included: Odin Base, Vehicle 1, Vehicle 2, Hotel 6, India 4, Group 1, Group 2, Echo, Foxtrot and a few others. Based on locations given they were located in and around some canyons in Northern Nevada. Below are some of the audio recordings.
Radio checks and occasional Brazilian radio pirates.
Units arriving at lay-up point for the night.
Sounded like a convoy escort of some kind.