The Career discription for the archmilitant is that they are weapon masters and leaders of soldiers. But at the first rank they don't get the command skill. Sure they can use almost any weapon under the sun, but their is a lot in RT about leading your troops and it all uses the command skill. I actually love how command skill is used in hit and run raids and boarding actions and it could be extrapolated to all sorts of great situations, but the one character who is supposed to be leading the men can't do it.
In most games not starting out as an officer really makes sense, but in RT you do start out as really important people. This comes out in all the other classes, but the archmilitant just comes off as a thug. Maybe that is what he is supposed to be, but if that is the case he just got a bit less interesting.
The easy fix is to just let him have the skill at first level in my game, but I am getting ready to run my first campain, and I am hesitant to mess with game rules until I have seen how they play out.