Halo: Large scale warfare
Between the Insurrection and the Covenant, the United Nation's Space Command's Defense Force has it's hands full. You will be taking command of elements of either a Marine Expeditionary Force(MEF) or a Naval fleet. Political events and moments of downtime will offer character development, but otherwise, the majority of the posting will consist of commanding and controlling your unit.
As hinted before, we will be fighting both human and alien forces. Initially we'll only be fighting local rebels, mostly be to get people adjusted/connected to the RP, but once we're all situated we'll move onto fighting the Covenant. The Human-Promethean war is up for debate, mostly whether or not we should play it out.
The enemy, the weather, the unit's morale and other factors will be determined by me. I will be presenting you the situation(i.e. the enemy, their movement, the setting, etc) and you will be presenting the solution. Units will vary from person to person depending on their personal preference/request, history and branch(Navy/Marines).
(This isn't as fleshed out as I would like it to be[in terms of telling you what the whole thing will be about, what you can expect, etc] but I'm hoping you'll overlook that fact it's in the morning and I'm still trying to remember my name.)