I died and when I revived back at an outpost Boomer was gone, and I can't seem to find him. The command companion buttons don't do anything. Any tips?
You need to go to the "Roster" screen . Second icon to the right of the map icon when you are viewing the map.On the PC there is no hotkey for the roster. You can select and dismiss Specialists from there.
I hope you find your Boomer