My favorite unit is the tier 4 infantry the solider/marine upgrades to on supremacy path, with the +10 heal upgrade pick. CNDR tier 2 will be your front line troops but I always have a couple of these medics for every combat group since their heal applies even if your CNDRs did not stop to heal. Basically they are walking half node that auto heals all adjacent units even if those units did not stop to heal. With alien preserve +5 and the other +10 building, your front line troops heal +25 even in unfriendly territory when fortified, and +10 when on the attack. Plus the medics are decent at finishing off wounded units. I find I play supremacy more and more because of the vindicator shoot and scoot, seraph double intercept, and these combat medics.