That's fine, if that's what you want. I personally will be making a Sangheili, an old veteran of the war.

I will probably create an OOC tomorrow, since I haven't seen any disagreement as far as the setting is concerned. The story will most likely focus on a specialist, multi-species team operating in the Joint Occupation Zone at the borders of UNSC and Swords of Sanghelios space. Anyone is free to make multiple characters if you like (just don't overwhelm yourself). Characters can of course be Spartans, Humans, and Sangheili. But, Unggoy (Grunts) and Kig-Yar (Jackals) are also valid options. A Mgalekgolo (Hunter) is probably a difficult sort of personality to portray, but I would be willing to let someone try. Jiralhanae (Brutes)...would be a lot harder to fit believably into the story. If anyone is wanting to try that, talk to me and we might be able to figure something out. No guarantees, though. Yanme'e (Drones) are a hive species, and probably not appropriate for the story.