You develop the ground combat weapons then design them as missile pods and then place them in the ground support pods on your fighters. Aa 1.6 hs pod will produce a weapon which tickles unarmoured humans. You need big pods , then you need lots of fighters , then you need the patience of a saint to deploy them, then they die. Make sure you have fire direction centers for some of your trooops or you cannot deploy the ground support craft at all