For me, the Androns roles ingame wouldbe something like this;
Andron Servitor - This is the "tireless worker", usually unarmed, but can use small arms (pistol/rifle) as an emergency.
Andron Soldier - This is your typical expendable troops, first in/last out. used mainly to guard/scout but also to provide lots of
"cheap" firepower, mainly equipped with rifles.
Andron Hunterkiller - The "Elite", few but powerful.. Used to hunt down tough enemies (YOU!) or as a bodyguard to leaders...
Luckily they are rare.. max 1 on map?!
For research?! Maybe better eletronics, exo-armor, advanced ammo...