What are these parts from my S250 shelter.

[rustystud]

Hello everyone. Yesterday I started cleaning out the S250 shelter I got off auction last summer. There are a few items I don't know what they do. So can someone tell me what these are.


These two pictures are of a "mount, resilient" MT-6146/VSQ-1 . So something mounts into it, but what ?


This is some little unit mounted near the door.

This unit was mounted on the wall above the bench.

Now this is of course some sort of circuit breaker box. But why in the world does it have both 120 Volts A/C and 24 Volts DC coming into it ?
Why not keep the different voltages separated ?

Does anyone know the answers to these questions ?

 

[m38inmaine]

First one in a SINCGARS mounting base, second is a DAGR mount(GPS), I also see a GPS antenna down next to the breaker box. Not sure about the third bracket, the GRC-142 shelter I had also shared AC/DC power, just the way they did it.