Mabye I'm not picking up what your laying down but this is what I was understanding. Team1 = (alpha team x 2 people, bravo x2 , charlie x 2, delta x 2). Team1 goes out to complete a mission and each sub team has roles to fill, am I correct?
It really doesn't matter, this is all finite details here. You seem very excited and it would help if you started with some basics to help start organize the frame work of your idea.
1. The Game Style, ie. one team vs. one team, multiple teams competing for something at the same time or through single evolutions? Is there a dedicated opfor and do they have engagement rules with stage progressions or is it just force on force?
2.What is the primary mission. Are there any secondary objectives that may come into play later in the game? What tasks/equipment will be required to complete these objectives? Will there be an exfil and/or when do you plan to call index?
3. What size are you planning for the different teams?
4.What location or type of terrain would best fit the mission dynamics?
5. How will the respawns and medic rules work if any?
6. How long do you think your missions might take to accomplish, will the missions last or will you be done in a few hours. What do you do if the teams complete your planned missions earlier than expected?
You have a few of these things figured out already. These are just a few things that would provide us with a good starting point so we know what kind of idea your looking at. Otherwise we are just shooting in the dark, there are so many ways to plan and host a game. If you need ideas, I'd recommend attending some of the games that are geared more towards the milsim aspect and see how others use elements to put a game together.