The Span of Control from Planetstorm reflect the various racial psychologies.
The morale rules never worked very well because the 3d6 bell curve made it so unlikely that anyone would break. For 3e I think we should drop the morale numbers by 5 points or so and then make it a straight line card draw Ace to King (ie. d13). The other thing I have played with for a long time but never got it into print is "barbarian morale" where the troops break easier, but they also rally (or even self-rally) easier. That would be reasonably accurate, historically speaking, for, say, the Mongol mounted archers. The colour fluff for the Oths on page 34 of the Alien Sourcebook illustrates the phenomenon well.
The barbarian morale rule would also apply to the Human Outworlders, Fantasian Privateers and certain Massaar units of the Black Empire. In theory, a unit of Omega-Machines could also use this rule.
What struck closest to home was the national armies in Planetstorm. These were a bit tongue in cheek and based on a combination of stereotypes and actual military doctrine. I can't count the number of US service men who were offended by the the "must always autofire" for American troops. They took it as an insult to their fire discipline. I diffused the situation by telling the marines that we were talking about the army, and I'd tell the army guys that we were talking about the marines. On the other hand, no one commented about a corporal commanding 8 other guys including a Behemoth and a Carl-G, a section 20% to 70% more powerful than the other national army sections.
There have been huge changes in the Canadian Forces since 9/11 and the installation of the Conservative government. JTF2 has emerged as one of the most bad-ass units around, and our snipers have scored 2000 metre kills and received the Bronze Star from the US. The line units have been in the hottest spots in Afghanistan leading up to our pull out this year.
But I digress.
I think that each race should field standard troops that follow the standard rules and then within the race there should be sub-groups who will have nifty features to them.
Machines: Overlord varients
Humans: National armies, special forces (SOG), JEF
Infranite: Tribes and JEF
Fantasian: Army, Security, Kezyrists, Privateers, Spetznas
Black Empire: Krafs, Massakar clans, "ninjas", and such