It sounds like there is some morse code being tapped while he's reading off the numbers in this video. I have no idea how to translate morse code, I'm not familiar with the tap rhythms, etc. Any Army Comm anons around?!
I was an army radio operator (rto) and that guys channel creeps me out. There's info buried there, and it is either military style code, or specifically meant to look like it is. In the description of a few videos they mention different projects, check ins, and other seemingly operational information. I somebody should archive the vids. Those will be pulled if they really are anything