A robot can be the communicator, if so desired. Leadership Organizing troops has its merits. An optional rule is the use of commanders. There must be one commander for each 10 men, plus another commander for every 40 troops. Each tank and personnel carrier will have a commander, and a higher-ranking leader is needed for every five vehicles.
Leadership adds realism and makes thing interesting.
If a leader is killed, a unit remains in place until another leader makes contact. The unit can retreat in the direction of the nearest commander. Naturally, you will want to have an extra officer or two in place to step in when other commanders get eliminated. Officers are usually armed with lighter weapons than the regular troops - say, a ray pistol instead of a zap rifle. Installations and stations will have whole command units, usually comprised of a base commander, his executive officer and an adjutant, plus a small corps of functionaries to oversee such departments as communications, security, supply and transport, etc.