HAM's are shorter range, better against small targets. More in your face play instead of sit back and spew missiles. Turn on your AB on all your guys and hit 'regroup' on your FC's fleet hud and all your guys will orbit you at 2500. You 'steer' with the one guy and the others try to keep up with him (like an incursion anchor essentially) and pound crap with missiles at short range. I'd like to do this with my harbingers, but I think I'm going to hose up my transversal badly if I do...missiles should work fine though.