It's good for a great deal, actually, but that's not the point.
Warfare is a major part of any multicultural setting (and what is SA if not multicultural?), but the question of the actual ways and means of war does come up. The methods and material for war are interesting discussions in a setting where you can actually reliably implement a starhammer tactic. While the machines of war can be spoken of (as I did with the Army of One, among others), the methods are also of importance. So, first and foremost, we have the most pivotal aspect of this discussion. Feel free to add to this in replies, or in subsequent threads.
"I get there the fastest with the most men."
-Nathan Bedford Forest
War is a mechanism by which one franchise force exerts its will on another. That franchise might be corporate, democratic, oligarchal, collective, popular, or any other, provided it has the vital resources needed (large-scale, organized forces capable of fighting). The primary mechanism falls under the principle that if someone can destroy something someone can control that thing. The aggressor takes physical possession of desired or critical resources from the enemy (indeed, this may be the entire purpose behind implementing this technique to begin with). The same technique is used to prevent the same.
Many, many more advanced techniques are developed around the basic concept of war, but the fundamental principle is to simply physically control or destroy, or at least position yourself to be able to destroy, resources that are either desired by you or critical to the enemy. At that point, memetics can be used to issue demands, or you can simply use what you've taken possession of and let the enemy believe it ot be unfair. One of the briliant aspects of war is the ability to then designate those who have succeeded as "heroes" - since the victors have dominance over the battlefield, they are the ones in the position to paint the picture of the victorious soldiers, typically using memetics to produce a universal view of the victors as having been right to do as they did (thus cutting off opportunities for retaliation).
Tech Levels: Metatech 2 (troop coordination and movement), and whatever technologies are used to outfit the forces. Note that advanced military doctrines are separate technologies.
Cost: Severe unless you have a considerable excess of population and weaponry