Hmm... Let's see...
UNSC:
- Vultures: I love gunships, slow but once they get going powerfull. Their barrage sounds mean too. What I'd give to pilot one of those :P
- Grizzlies: These things can take a lot of damage, they look way more awesome than other UNSC ground vehicles too.
- Shortsword counts too? (You know, the plane that drops things like Carpet Bombs) I just like bomb planes.
- Elephant, even though not that practical in-game, I like their purpose. Though I'm not a great fan of the Halo 3's open Elephant.
Awesome picture: http://images1.wikia.nocookie.net/halo/images/9/98/Screenshot_6_preview.jpg
- Pelican: I just think they're awesome. Even though not an actual buildable unit, they're just great.
- ODST: What can I say? Special forces.
Covenant:
- Locust: They're just great. They're vulnerable but they pack quite the punch, they're not meant to take damage, they're the annoying ambush units that blow up your base.
- Spirit aka Dropship: Like the pelican. I think troop transport vehicles are pretty interesting, especially the way this thing drops stuff.
- Prophet (of regret): They manage to more or less mind control the whole covenant through their psychological games, his cleansing beam is awesome and he has sentinel pets. Great combo.
- Brute Chieftain: Great guy, Vortex is a great ability, and pummeling vehicles over mountains towards your brute is a great sight too.
- Brutes: They do a great job against almost everything.
- Jackals: Snipers & Scouts. No need to say more.
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Quite the list, no?
Gamertag: vHaaze - No really, whatever my account says is a lie. I can't change it either, it says it's on vHaaze in the option thing!