I see the irony don't worry but with unbalanced comms enabled, it seems the Arm commander's range is bugged or something. Direct attack orders just makes Arm comm stand there looking at the enemies with cute bug eyes but if you creep it forward with a move order it will start opening fire properly. Cor comm doesn't do that, it just goes mental decimating every T1 squishy insect. Some math somewhere seems to be problematic with Arm's.
I'm probably the sole person that plays with Unba though