there should be 3 vehicle classes, i for each faction: gunship, transport, and fighter
UNSC:
-pelican, heavy transport (reach version)
-sabre, longsword, shortsword, or broadsword, fighter
-hawk (Halo wars), falcon, hornet or something like this (courtesy of deviantart) for gunship
Covenant
-Phantom, heavy transport
-banshee or seraph, fighter
-vampire(halo wars) gunship