Halo Wars Contributions.

[Savior]

This seems to be a bugger. Should we allow, if any, the vehicles and weapons from the Halo Wars game?

Hell Bringers: Known as flamethrower guys. Not alot of use except for flood counters, which at this point in time have not occured in the main mission story.
halo.wikia.com/wiki/Hellbringers

Elephants: By UNSC logic, if these were allowed, these would be given their own callsign such as "Leviathan" or "Behemoth". Would prove to be value assets to mobile ground forces.
halo.wikia.com/wiki/Behemoth-class_Troop_Transport

Gremlins: Boy, not sure about these. Even if the UNSC had these, they would short themselves out unless the damn thing is ran by pedals and a lever for the magnetis pulse. After that rediculous statement, the weapon would only be good against heavy covenant shielding.
halo.wikia.com/wiki/Gremlin_Combat_Support_Vehicle

Rhino: Artilliry tank, simple as that. Could have an effect on a battle influence and other things. Like shooting down a wall, or taking strikes at enemy camps or bases.
halo.wikia.com/wiki/M-145D_Rhino

Wolverine: I find myself pulled towards this as it is the only trace of UNSC AA weaponry in existance. Would provide an even battle ground since the Covenant have shields, plasma, and cannons capable of glassing a planet.
halo.wikia.com/wiki/Wolverine

Cobra: Not gonna lie, if you can see a need for this tell me. Because this thing is just a double barreled Rhino to me.
halo.wikia.com/wiki/Cobra

Cyclops: Ah, heres the heated one. Faulty power core, slow, not much use. Not alot of reasons for it to be deployed unless we have an epic moment where it becomes like those mechs in the matrix.
halo.wikia.com/wiki/Cyclops

Vulture:...Really? It's a huge arse mega death machine, vastly over powered and unnecassery. Give me one plausible reason that this should be allowed.
halo.wikia.com/wiki/Vulture

Locust: Now I can see these being used. Lesser grade Scarabs with lesser threat value. I don't expect ten of these to be in the same area, but they aren't limited to just one at a time.
halo.wikia.com/wiki/Locust

Vampires: Are really pushing it, the drain factor is beyond stupid. So it's been replaced with a plasm bomb feature. Basically a Covenant bomber.
halo.wikia.com/wiki/Vampire

[Seraph]

Hell Bringers: They seem to be a less practical shock trooper to me. Though I feel that they could be an interesting addition to the UNSC arsenal for special occasions like if we were to ever go spelunking in dark, tight quarters for an extended period. Good for smoking out enemies from their holes, bunkers, and entrenchments. Maybe put these on hold as the Hell Bringers are a specialty unit used for extra special occasions but not actively use them all the time.

Elephants: Yes, very useful in scenarios where there may not be any facilities handy on a barren planet almost void of cover and such.

Gremlins: Useless game mechanic. No.

Rhino: Tough call. Scorpions are more a general purpose vehicle, but a siege tank sounds tempting. Put these on hold for discussion.

Wolverine: Mobile AA missile platforms to be the UNSC counterpart to the Covie AA guns. Yes.

Cobra: Not really feeling this one. We have gause hogs that could drive circles around these things. No not really.

Cyclops: Strict cargo and maintenance uses. Not much place on the battlefield unless the situation was hopeless and these clunkers were all they had. Keep em, just don't put em on the battle field.

Vulture:...No...

Locust: Very plausible. I could live with or without these though. They would definitely bring an assault element to the field that the Wraith mortar tanks can't.