Cap. Crew vehicles. Stick some bazookas on them for an extra AT squad. Crew a team weapon to ditch the squad entirely if you don't actually want it.
You could also use the Captain specifically to supervise production without tying up a hefty chunk of pop sitting in your base doing nothing.
Or spend 83 MP on making them 5 man. I see no reason you couldn't offer that upgrade to the Major too.
So being a burden more than anything else in definitive.