If You Mean change into elite, no, you can only do that in Halo 2, 3 and Halo Reach. But however you can use mods at halomods.com
You cannot play as Covenant in the original Halo
no... its before Halo 1 when the humans have just started fighting with the Covenant
In Halo 3 the covenant does die, the covenant will never be in another Halo game.
The covenant is an alien species in halo including grunts and elites.
the biggest ship in halo is a covenant cruiser.
it is when the covenant activate halo and destroy the humans and the flood
No, the only teams you can be in Halo Wars is the Marines and the Covenant
The Covenant are the main enemy of the Halo Franchise.
NOPE
No. This arbiter is a tyrant, and was even kept in jail for stuff against the covenant. also, Halo Wars is obviously before Halo 1, and the arbiter in Halo 3 gained the title in Halo 2.
In Halo 4 there are two species of enemy. The Covenant and the Prometheans. The Covenant consists of grunts, jackals, skirmishers, elites, and hunters. The Prometheans are the crawlers, knights, and watchers.
No, the only teams you can be in Halo Wars are the Marines (humans) and the Covenant.