Think about it!
The Vex=Death: The Vex are an inescapable force, immortal through time and a danger to all forms of life. They bring end to the living as if they were a key component of the nature of the universe itself.
The Fallen=Famine: The Fallen are a scavenging race, picking at the bones of the golden age. They are completely dependent on the machine gods that sustain them. All they do is consume.
The Cabal=War: The Cabal are a race of warriors, their very fundamentals based on the dominance of other intelligent species. A WARpath has been left in their wake that nothing will stop.
The Hive=Pestilence: The Hive exist as an aversion to natural order. They are a sickly force of mortality bent on a virus-like mechanism of sacrifice and mass production used to invade and hollow out worlds.
See! In all honesty, I feel like the Vex and the Hive could switch roles, but I only say that the hive represent pestilence because of their diseased appearance. Also, the enemy races heralded the dark age, did they not? Thoughts?
Edit: Regarding the conquest/pestilence debate, I used the pestilence interpretation because that's what I'm familiar with. In line with conquest:
Vex=Conquest
Cabal=War
Fallen=Famine
Hive=Death
English
#Destiny
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I like to think of this. Have any of you guys [i]died[/i] enough times to actually notice the different armies weapons tech? Or read the Grimoire cards? Fallen have arc and solar weapons. The vex have solar and void weapons. The hive use arc and void weapons. Seems familiar? Fallen=Hunters Vex=warlocks Hive=Titans. I have no idea how I can fit the cabal into this. Maybe they're more like pawns. They're only true motivation and purpose is to please thier superiors. Well then again that's every other foot soldier in the other 3 armies. Maybe the cabal are servants to what ever the psions are since the psions are obviously smarter than the cabal.